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{{task}} Note that in the following explanation list indices are assumed to start at ''one''.

;Definition of lucky numbers ''[[wp:Lucky number|Lucky numbers]]'' are positive integers that are formed by:

Form a list of all the positive odd integers > 0

1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39 ...

Return the first number from the list (which is '''1''').

(Loop begins here)

#* Note then return the second number from the list (which is '''3'''). #* Discard every third, (as noted), number from the list to form the new list 1, 3, 7, 9, 13, 15, 19, 21, 25, 27, 31, 33, 37, 39, 43, 45, 49, 51, 55, 57 ...

(Expanding the loop a few more times...)

#* Note then return the third number from the list (which is '''7'''). #* Discard every 7th, (as noted), number from the list to form the new list 1, 3, 7, 9, 13, 15, 21, 25, 27, 31, 33, 37, 43, 45, 49, 51, 55, 57, 63, 67 ... #* Note then return the 4th number from the list (which is '''9'''). #* Discard every 9th, (as noted), number from the list to form the new list 1, 3, 7, 9, 13, 15, 21, 25, 31, 33, 37, 43, 45, 49, 51, 55, 63, 67, 69, 73 ... #* Take the 5th, i.e. '''13'''. Remove every 13th. #* Take the 6th, i.e. '''15'''. Remove every 15th. #* Take the 7th, i.e. '''21'''. Remove every 21th. #* Take the 8th, i.e. '''25'''. Remove every 25th.

(Rule for the loop)

#* Note the nth, which is m. #* Remove every mth. #* Increment n.

;Definition of even lucky numbers This follows the same rules as the definition of lucky numbers above ''except for the very first step'':

Form a list of all the positive '''even''' integers > 0

2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40 ...

Return the first number from the list (which is '''2''').

(Loop begins here)

#* Note then return the second number from the list (which is '''4'''). #* Discard every 4th, (as noted), number from the list to form the new list 2, 4, 6, 10, 12, 14, 18, 20, 22, 26, 28, 30, 34, 36, 38, 42, 44, 46, 50, 52 ...

(Expanding the loop a few more times...)

#* Note then return the third number from the list (which is '''6'''). #* Discard every 6th, (as noted), number from the list to form the new list 2, 4, 6, 10, 12, 18, 20, 22, 26, 28, 34, 36, 38, 42, 44, 50, 52, 54, 58, 60 ... #* Take the 4th, i.e. '''10'''. Remove every 10th. #* Take the 5th, i.e. '''12'''. Remove every 12th.

(Rule for the loop)

#* Note the nth, which is m. #* Remove every mth. #* Increment n.

;Task requirements

  • Write one or two subroutines (functions) to generate ''lucky numbers'' and ''even lucky numbers''
  • Write a command-line interface to allow selection of which kind of numbers and which number(s). Since input is from the command line, tests should be made for the common errors: ** missing arguments ** too many arguments ** number (or numbers) aren't legal ** misspelled argument ('''lucky''' or '''evenLucky''')
  • The command line handling should: ** support mixed case handling of the (non-numeric) arguments ** support printing a particular number ** support printing a range of numbers by their index ** support printing a range of numbers by their values
  • The resulting list of numbers should be printed on a single line.

The program should support the arguments:


                             what is displayed  (on a single line)
       argument(s)              (optional verbiage is encouraged)
  ╔═══════════════════╦════════════════════════════════════════════════════╗
  ║  j                ║  Jth       lucky number                            ║
  ║  j  ,      lucky  ║  Jth       lucky number                            ║
  ║  j  ,  evenLucky  ║  Jth  even lucky number                            ║
  ║                   ║                                                    ║
  ║  j  k             ║  Jth  through  Kth (inclusive)       lucky numbers ║
  ║  j  k      lucky  ║  Jth  through  Kth (inclusive)       lucky numbers ║
  ║  j  k  evenLucky  ║  Jth  through  Kth (inclusive)  even lucky numbers ║
  ║                   ║                                                    ║
  ║  j -k             ║  all       lucky numbers in the range  j ──► |k|   ║
  ║  j -k      lucky  ║  all       lucky numbers in the range  j ──► |k|   ║
  ║  j -k  evenLucky  ║  all  even lucky numbers in the range  j ──► |k|   ║
  ╚═══════════════════╩════════════════════════════════════════════════════╝
                           where    |k|    is the absolute value of   k

Demonstrate the program by:

  • showing the first twenty ''lucky'' numbers
  • showing the first twenty ''even lucky'' numbers
  • showing all ''lucky'' numbers between 6,000 and 6,100 (inclusive)
  • showing all ''even lucky'' numbers in the same range as above
  • showing the 10,000th ''lucky'' number (extra credit)
  • showing the 10,000th ''even lucky'' number (extra credit)

;See also:

  • This task is related to the [[Sieve of Eratosthenes]] task.
  • OEIS Wiki [http://oeis.org/wiki/Lucky_numbers Lucky numbers].
  • Sequence [https://oeis.org/A000959 A000959 lucky numbers] on The On-Line Encyclopedia of Integer Sequences.
  • Sequence [https://oeis.org/A045954 A045954 even lucky numbers or ELN] on The On-Line Encyclopedia of Integer Sequences.
  • Entry [http://mathworld.wolfram.com/LuckyNumber.html lucky numbers] on The Eric Weisstein's World of Mathematics.

C++

{{trans|Go}}

#include <algorithm>
#include <iostream>
#include <iterator>
#include <vector>

const int luckySize = 60000;
std::vector<int> luckyEven(luckySize);
std::vector<int> luckyOdd(luckySize);

void init() {
    for (int i = 0; i < luckySize; ++i) {
        luckyEven[i] = i * 2 + 2;
        luckyOdd[i] = i * 2 + 1;
    }
}

void filterLuckyEven() {
    for (size_t n = 2; n < luckyEven.size(); ++n) {
        int m = luckyEven[n - 1];
        int end = (luckyEven.size() / m) * m - 1;
        for (int j = end; j >= m - 1; j -= m) {
            std::copy(luckyEven.begin() + j + 1, luckyEven.end(), luckyEven.begin() + j);
            luckyEven.pop_back();
        }
    }
}

void filterLuckyOdd() {
    for (size_t n = 2; n < luckyOdd.size(); ++n) {
        int m = luckyOdd[n - 1];
        int end = (luckyOdd.size() / m) * m - 1;
        for (int j = end; j >= m - 1; j -= m) {
            std::copy(luckyOdd.begin() + j + 1, luckyOdd.end(), luckyOdd.begin() + j);
            luckyOdd.pop_back();
        }
    }
}

void printBetween(size_t j, size_t k, bool even) {
    std::ostream_iterator<int> out_it{ std::cout, ", " };

    if (even) {
        size_t max = luckyEven.back();
        if (j > max || k > max) {
            std::cerr << "At least one are is too big\n";
            exit(EXIT_FAILURE);
        }

        std::cout << "Lucky even numbers between " << j << " and " << k << " are: ";
        std::copy_if(luckyEven.begin(), luckyEven.end(), out_it, [j, k](size_t n) {
            return j <= n && n <= k;
        });
    } else {
        size_t max = luckyOdd.back();
        if (j > max || k > max) {
            std::cerr << "At least one are is too big\n";
            exit(EXIT_FAILURE);
        }

        std::cout << "Lucky numbers between " << j << " and " << k << " are: ";
        std::copy_if(luckyOdd.begin(), luckyOdd.end(), out_it, [j, k](size_t n) {
            return j <= n && n <= k;
        });
    }
    std::cout << '\n';
}

void printRange(size_t j, size_t k, bool even) {
    std::ostream_iterator<int> out_it{ std::cout, ", " };
    if (even) {
        if (k >= luckyEven.size()) {
            std::cerr << "The argument is too large\n";
            exit(EXIT_FAILURE);
        }
        std::cout << "Lucky even numbers " << j << " to " << k << " are: ";
        std::copy(luckyEven.begin() + j - 1, luckyEven.begin() + k, out_it);
    } else {
        if (k >= luckyOdd.size()) {
            std::cerr << "The argument is too large\n";
            exit(EXIT_FAILURE);
        }
        std::cout << "Lucky numbers " << j << " to " << k << " are: ";
        std::copy(luckyOdd.begin() + j - 1, luckyOdd.begin() + k, out_it);
    }
}

void printSingle(size_t j, bool even) {
    if (even) {
        if (j >= luckyEven.size()) {
            std::cerr << "The argument is too large\n";
            exit(EXIT_FAILURE);
        }
        std::cout << "Lucky even number " << j << "=" << luckyEven[j - 1] << '\n';
    } else {
        if (j >= luckyOdd.size()) {
            std::cerr << "The argument is too large\n";
            exit(EXIT_FAILURE);
        }
        std::cout << "Lucky number " << j << "=" << luckyOdd[j - 1] << '\n';
    }
}

void help() {
    std::cout << "./lucky j [k] [--lucky|--evenLucky]\n";
    std::cout << "\n";
    std::cout << "       argument(s)        |  what is displayed\n";
    std::cout << "
### ========================================
\n";
    std::cout << "-j=m                      |  mth lucky number\n";
    std::cout << "-j=m  --lucky             |  mth lucky number\n";
    std::cout << "-j=m  --evenLucky         |  mth even lucky number\n";
    std::cout << "-j=m  -k=n                |  mth through nth (inclusive) lucky numbers\n";
    std::cout << "-j=m  -k=n  --lucky       |  mth through nth (inclusive) lucky numbers\n";
    std::cout << "-j=m  -k=n  --evenLucky   |  mth through nth (inclusive) even lucky numbers\n";
    std::cout << "-j=m  -k=-n               |  all lucky numbers in the range [m, n]\n";
    std::cout << "-j=m  -k=-n  --lucky      |  all lucky numbers in the range [m, n]\n";
    std::cout << "-j=m  -k=-n  --evenLucky  |  all even lucky numbers in the range [m, n]\n";
}

int main(int argc, char **argv) {
    bool evenLucky = false;
    int j = 0;
    int k = 0;

    // skip arg 0, because that is just the executable name
    if (argc < 2) {
        help();
        exit(EXIT_FAILURE);
    }

    bool good = false;
    for (int i = 1; i < argc; ++i) {
        if ('-' == argv[i][0]) {
            if ('-' == argv[i][1]) {
                // long args
                if (0 == strcmp("--lucky", argv[i])) {
                    evenLucky = false;
                } else if (0 == strcmp("--evenLucky", argv[i])) {
                    evenLucky = true;
                } else {
                    std::cerr << "Unknown long argument: [" << argv[i] << "]\n";
                    exit(EXIT_FAILURE);
                }
            } else {
                // short args
                if ('j' == argv[i][1] && '=' == argv[i][2] && argv[i][3] != 0) {
                    good = true;
                    j = atoi(&argv[i][3]);
                } else if ('k' == argv[i][1] && '=' == argv[i][2]) {
                    k = atoi(&argv[i][3]);
                } else {
                    std::cerr << "Unknown short argument: " << argv[i] << '\n';
                    exit(EXIT_FAILURE);
                }
            }
        } else {
            std::cerr << "Unknown argument: " << argv[i] << '\n';
            exit(EXIT_FAILURE);
        }
    }
    if (!good) {
        help();
        exit(EXIT_FAILURE);
    }

    init();
    filterLuckyEven();
    filterLuckyOdd();
    if (k > 0) {
        printRange(j, k, evenLucky);
    } else if (k < 0) {
        printBetween(j, -k, evenLucky);
    } else {
        printSingle(j, evenLucky);
    }

    return 0;
}

{{out}}

&gt;LuckyNumbers.exe -j=1 -k=20
Lucky numbers 1 to 20 are: 1, 3, 7, 9, 13, 15, 21, 25, 31, 33, 37, 43, 49, 51, 63, 67, 69, 73, 75, 79,

&gt;LuckyNumbers.exe -j=1 -k=20 --evenLucky
Lucky even numbers 1 to 20 are: 2, 4, 6, 10, 12, 18, 20, 22, 26, 34, 36, 42, 44, 50, 52, 54, 58, 68, 70, 76,

&gt;LuckyNumbers.exe -j=6000 -k=-6100
Lucky numbers between 6000 and 6100 are: 6009, 6019, 6031, 6049, 6055, 6061, 6079, 6093,

&gt;LuckyNumbers.exe -j=6000 -k=-6100 --evenLucky
Lucky even numbers between 6000 and 6100 are: 6018, 6020, 6022, 6026, 6036, 6038, 6050, 6058, 6074, 6090, 6092,

&gt;LuckyNumbers.exe -j=10000
Lucky number 10000=115591

&gt;LuckyNumbers.exe -j=10000 --evenLucky
Lucky even number 10000=111842

D

import std.algorithm;
import std.concurrency;
import std.conv;
import std.getopt;
import std.range;
import std.stdio;

auto lucky(bool even, int nmax=200_000) {
    import std.container.array;

    int start = even ? 2 : 1;

    return new Generator!int({
        auto ln = make!(Array!int)(iota(start,nmax,2));

        // yield the first number
        yield(ln[0]);

        int n=1;
        for(; n<ln.length/2+1; n++) {
            yield(ln[n]);

            int step = ln[n]-1;

            // remove the non-lucky numbers related to the current lucky number
            for (int i=step; i<ln.length; i+=step) {
                ln.linearRemove(ln[].drop(i).take(1));
            }
        }

        // yield all remaining values
        foreach(val; ln[n..$]) {
            yield(val);
        }
    });
}

void help(Option[] opt) {
    defaultGetoptPrinter("./lucky j [k] [--lucky|--evenLucky]", opt);

    writeln;
    writeln("       argument(s)        |  what is displayed");
    writeln("
### ========================================
");
    writeln("-j=m                      |  mth lucky number");
    writeln("-j=m  --lucky             |  mth lucky number");
    writeln("-j=m  --evenLucky         |  mth even lucky number");
    writeln("-j=m  -k=n                |  mth through nth (inclusive) lucky numbers");
    writeln("-j=m  -k=n  --lucky       |  mth through nth (inclusive) lucky numbers");
    writeln("-j=m  -k=n  --evenLucky   |  mth through nth (inclusive) even lucky numbers");
    writeln("-j=m  -k=-n               |  all lucky numbers in the range [m, n]");
    writeln("-j=m  -k=-n  --lucky      |  all lucky numbers in the range [m, n]");
    writeln("-j=m  -k=-n  --evenLucky  |  all even lucky numbers in the range [m, n]");
}

void main(string[] args) {
    int j;
    int k;
    bool evenLucky = false;

    void luckyOpt() {
        evenLucky = false;
    }
    auto helpInformation = getopt(
        args,
        std.getopt.config.passThrough,
        std.getopt.config.required,
        "j", "The starting point to generate lucky numbers", &j,
        "k", "The ending point for generating lucky numbers", &k,
        "lucky", "Specify to generate a list of lucky numbers", &luckyOpt,
        "evenLucky", "Specify to generate a list of even lucky numbers", &evenLucky
    );

    if (helpInformation.helpWanted) {
        help(helpInformation.options);
        return;
    }

    if (k>0) {
        lucky(evenLucky).drop(j-1).take(k-j+1).writeln;
    } else if (k<0) {
        auto f = (int a) => j<=a && a<=-k;
        lucky(evenLucky, -k).filter!f.writeln;
    } else {
        lucky(evenLucky).drop(j-1).take(1).writeln;
    }
}

{{out}}

.\lucky_and_even_lucky_numbers.exe -j=1 -k=20
[1, 3, 7, 9, 13, 15, 21, 25, 31, 33, 37, 43, 49, 51, 63, 67, 69, 73, 75, 79]

.\lucky_and_even_lucky_numbers.exe -j=1 -k=20 --evenLucky
[2, 4, 6, 10, 12, 18, 20, 22, 26, 34, 36, 42, 44, 50, 52, 54, 58, 68, 70, 76]

.\lucky_and_even_lucky_numbers.exe -j=6000 -k=-6100
[6009, 6019, 6031, 6049, 6055, 6061, 6079, 6093]

.\lucky_and_even_lucky_numbers.exe -j=6000 -k=-6100 --evenLucky
[6018, 6020, 6022, 6026, 6036, 6038, 6050, 6058, 6074, 6090, 6092]

.\lucky_and_even_lucky_numbers.exe -j=10000
[115591]

.\lucky_and_even_lucky_numbers.exe -j=10000 --evenLucky
[111842]

Go

{{trans|Kotlin}}

package main

import (
    "fmt"
    "log"
    "os"
    "strconv"
    "strings"
)

const luckySize = 60000

var luckyOdd = make([]int, luckySize)
var luckyEven = make([]int, luckySize)

func init() {
    for i := 0; i < luckySize; i++ {
        luckyOdd[i] = i*2 + 1
        luckyEven[i] = i*2 + 2
    }
}

func filterLuckyOdd() {
    for n := 2; n < len(luckyOdd); n++ {
        m := luckyOdd[n-1]
        end := (len(luckyOdd)/m)*m - 1
        for j := end; j >= m-1; j -= m {
            copy(luckyOdd[j:], luckyOdd[j+1:])
            luckyOdd = luckyOdd[:len(luckyOdd)-1]
        }
    }
}

func filterLuckyEven() {
    for n := 2; n < len(luckyEven); n++ {
        m := luckyEven[n-1]
        end := (len(luckyEven)/m)*m - 1
        for j := end; j >= m-1; j -= m {
            copy(luckyEven[j:], luckyEven[j+1:])
            luckyEven = luckyEven[:len(luckyEven)-1]
        }
    }
}

func printSingle(j int, odd bool) error {
    if odd {
        if j >= len(luckyOdd) {
            return fmt.Errorf("the argument, %d, is too big", j)
        }
        fmt.Println("Lucky number", j, "=", luckyOdd[j-1])
    } else {
        if j >= len(luckyEven) {
            return fmt.Errorf("the argument, %d, is too big", j)
        }
        fmt.Println("Lucky even number", j, "=", luckyEven[j-1])
    }
    return nil
}

func printRange(j, k int, odd bool) error {
    if odd {
        if k >= len(luckyOdd) {
            return fmt.Errorf("the argument, %d, is too big", k)
        }
        fmt.Println("Lucky numbers", j, "to", k, "are:")
        fmt.Println(luckyOdd[j-1 : k])
    } else {
        if k >= len(luckyEven) {
            return fmt.Errorf("the argument, %d, is too big", k)
        }
        fmt.Println("Lucky even numbers", j, "to", k, "are:")
        fmt.Println(luckyEven[j-1 : k])
    }
    return nil
}

func printBetween(j, k int, odd bool) error {
    var r []int
    if odd {
        max := luckyOdd[len(luckyOdd)-1]
        if j > max || k > max {
            return fmt.Errorf("at least one argument, %d or %d, is too big", j, k)
        }
        for _, num := range luckyOdd {
            if num < j {
                continue
            }
            if num > k {
                break
            }
            r = append(r, num)
        }
        fmt.Println("Lucky numbers between", j, "and", k, "are:")
        fmt.Println(r)
    } else {
        max := luckyEven[len(luckyEven)-1]
        if j > max || k > max {
            return fmt.Errorf("at least one argument, %d or %d, is too big", j, k)
        }
        for _, num := range luckyEven {
            if num < j {
                continue
            }
            if num > k {
                break
            }
            r = append(r, num)
        }
        fmt.Println("Lucky even numbers between", j, "and", k, "are:")
        fmt.Println(r)
    }
    return nil
}

func main() {
    nargs := len(os.Args)
    if nargs < 2 || nargs > 4 {
        log.Fatal("there must be between 1 and 3 command line arguments")
    }
    filterLuckyOdd()
    filterLuckyEven()
    j, err := strconv.Atoi(os.Args[1])
    if err != nil || j < 1 {
        log.Fatalf("first argument, %s, must be a positive integer", os.Args[1])
    }
    if nargs == 2 {
        if err := printSingle(j, true); err != nil {
            log.Fatal(err)
        }
        return
    }

    if nargs == 3 {
        k, err := strconv.Atoi(os.Args[2])
        if err != nil {
            log.Fatalf("second argument, %s, must be an integer", os.Args[2])
        }
        if k >= 0 {
            if j > k {
                log.Fatalf("second argument, %d, can't be less than first, %d", k, j)
            }
            if err := printRange(j, k, true); err != nil {
                log.Fatal(err)
            }
        } else {
            l := -k
            if j > l {
                log.Fatalf("second argument, %d, can't be less in absolute value than first, %d", k, j)
            }
            if err := printBetween(j, l, true); err != nil {
                log.Fatal(err)
            }
        }
        return
    }

    var odd bool
    switch lucky := strings.ToLower(os.Args[3]); lucky {
    case "lucky":
        odd = true
    case "evenlucky":
        odd = false
    default:
        log.Fatalf("third argument, %s, is invalid", os.Args[3])
    }
    if os.Args[2] == "," {
        if err := printSingle(j, odd); err != nil {
            log.Fatal(err)
        }
        return
    }

    k, err := strconv.Atoi(os.Args[2])
    if err != nil {
        log.Fatal("second argument must be an integer or a comma")
    }
    if k >= 0 {
        if j > k {
            log.Fatalf("second argument, %d, can't be less than first, %d", k, j)
        }
        if err := printRange(j, k, odd); err != nil {
            log.Fatal(err)
        }
    } else {
        l := -k
        if j > l {
            log.Fatalf("second argument, %d, can't be less in absolute value than first, %d", k, j)
        }
        if err := printBetween(j, l, odd); err != nil {
            log.Fatal(err)
        }
    }
}

{{out}}


$ ./lucky 1 20
Lucky numbers 1 to 20 are:
[1 3 7 9 13 15 21 25 31 33 37 43 49 51 63 67 69 73 75 79]

$ ./lucky 1 20 evenLucky
Lucky even numbers 1 to 20 are:
[2 4 6 10 12 18 20 22 26 34 36 42 44 50 52 54 58 68 70 76]

$ ./lucky 6000 -6100
Lucky numbers between 6000 and 6100 are:
[6009 6019 6031 6049 6055 6061 6079 6093]

$ ./lucky 6000 -6100 evenLucky
Lucky even numbers between 6000 and 6100 are:
[6018 6020 6022 6026 6036 6038 6050 6058 6074 6090 6092]

$ ./lucky 10000 , lucky
Lucky number 10000 = 115591

$ ./lucky 10000 , evenLucky
Lucky even number 10000 = 111842

Haskell

Haskell is a very nice language for this problem because it is a lazy language. Here regular expressions and data types are used.


import System.Environment
import Text.Regex.Posix

data Lucky = Lucky | EvenLucky

helpMessage :: IO ()
helpMessage = do
  putStrLn "                           what is displayed  (on a single line)"
  putStrLn "     argument(s)              (optional verbiage is encouraged)"
  putStrLn "
### ================
|
### =============================================
"
  putStrLn " j                    | Jth       lucky number                            "
  putStrLn " j  ,          lucky  | Jth       lucky number                            "
  putStrLn " j  ,      evenLucky  | Jth  even lucky number                            "
  putStrLn "                                                                          "
  putStrLn " j  k                 | Jth  through  Kth (inclusive)       lucky numbers "
  putStrLn " j  k          lucky  | Jth  through  Kth (inclusive)       lucky numbers "
  putStrLn " j  k      evenlucky  | Jth  through  Kth (inclusive)  even lucky numbers "
  putStrLn "                                                                          "
  putStrLn " j -k                 | all       lucky numbers in the range  j -> |k|    "
  putStrLn " j -k          lucky  | all       lucky numbers in the range  j -> |k|    "
  putStrLn " j -k      evenlucky  | all  even lucky numbers in the range  j -> |k|    "
  putStrLn "
### ================
|
### =============================================
"

oddNumbers :: [Int]
oddNumbers = filter odd [1..]

evenNumbers :: [Int]
evenNumbers = filter even [1..]

luckyNumbers :: [Int] -> [Int]
luckyNumbers xs =
  let i = 3 in
  sieve i xs
    where
      sieve i (ln:s:xs) =
        ln : sieve (i + 1) (s : [x | (n, x) <- zip [i..] xs, rem n s /= 0])

nth :: Int -> Lucky -> Int
nth j Lucky     = luckyNumbers oddNumbers !! (j-1)
nth j EvenLucky = luckyNumbers evenNumbers !! (j-1)

range :: Int -> Int -> Lucky -> [Int]
range x x2 Lucky     = drop (x-1) (take x2 (luckyNumbers oddNumbers))
range x x2 EvenLucky = drop (x-1) (take x2 (luckyNumbers evenNumbers))

interval :: Int -> Int -> Lucky -> [Int]
interval x x2 Lucky     = dropWhile (<x) (takeWhile (<=x2) (luckyNumbers oddNumbers))
interval x x2 EvenLucky = dropWhile (<x) (takeWhile (<=x2) (luckyNumbers evenNumbers))

lucky :: [String] -> Lucky
lucky xs =
  if "evenLucky" `elem` xs
   then EvenLucky
   else Lucky

readn :: String -> Int
readn s = read s :: Int

isInt :: String -> Bool
isInt s = not (null (s =~ "-?[0-9]{0,10}" :: String))

main :: IO ()
main = do
  args <- getArgs
  if head args == "--help" || null args
    then
      helpMessage
    else
      let l = lucky args in
      case map readn (filter isInt args) of
        [] -> do
          putStrLn "Invalid input, missing arguments"
          putStrLn "Type --help"
        [x] -> print (nth x l)
        [x, x2] -> if x2 > 0
          then print (range x x2 l)
          else print (interval x (-x2) l)
        _ -> do
          putStrLn "Invalid input, wrong number of arguments"
          putStrLn "Type --help"

{{out}}

$ luckyNumbers 1 20
[1,3,7,9,13,15,21,25,31,33,37,43,49,51,63,67,69,73,75,79]
$ luckyNumbers 1 20 evenLucky
[2,4,6,10,12,18,20,22,26,34,36,42,44,50,52,54,58,68,70,76]
$ luckyNumbers 6000 -6100 lucky
[6009,6019,6031,6049,6055,6061,6079,6093]
$ luckyNumbers 6000 -6100 evenLucky
[6018,6020,6022,6026,6036,6038,6050,6058,6074,6090,6092]
$ luckyNumbers 10000
115591
$ luckyNumbers 10000 evenLucky
111842

J

Not going for extra credit because I want to encourage functional reactive "types" in J. (Note that FRP, along with an ML typed compiler, would probably remove the motivation for the while loop in this implementation.)

Implementation:

luckySeq=:3 :0
  1 luckySeq y
:
  len=.0
  nth=.0
  seq=.x+2*i.4*y
  while.  len~:#seq do.
    len=. #seq
    nth=. nth+1
    seq=. nth exclude seq
  end.
)

exclude=: ] #~ 1 - #@] $ -@{ {. 1:

lucky=:''
evenLucky=:0
program=:3 :0
  range=: |y-.0
  seq=. (1+0 e.y) luckySeq >./range
  if. 0><./y do.
    (#~ e.&(thru/range)) seq
  else.
    (<:thru/range) { seq
  end.
)

thru=: <./ + i.@(+*)@-~

Task:

   program 1 20
1 3 7 9 13 15 21 25 31 33 37 43 49 51 63 67 69 73 75 79
   program 1 20,evenLucky
2 4 6 10 12 18 20 22 26 34 36 42 44 50 52 54 58 68 70 76
   program 6000,-6100
6009 6019 6031 6049 6055 6061 6079 6093
   program 6000,-6100,evenLucky
6018 6020 6022 6026 6036 6038 6050 6058 6074 6090 6092

Note that I've used the J command line rather than a unix or windows command line. This is because J is portable to a wide variety of environments (including phones) and there's no reliably common command line that exists across all these environments. Therefore, J must provide its own, and J's command line requires some slight syntax changes from the suggestions implicit in this task.

Julia

This iterator for lucky numbers is semi-lazy: it completes one pass of the filter each iteration.

using Base, StringDistances

struct Lucky
    start::Int
    nmax::Int
    Lucky(iseven, nmax) = new(iseven ? 2 : 1, nmax)
end

struct LuckyState
    nextindex::Int
    sequence::Vector{Int}
end

Base.eltype(iter::Lucky) = Int

function Base.iterate(iter::Lucky, state = LuckyState(1, collect(iter.start:2:iter.nmax)))
    if length(state.sequence) < state.nextindex
        return nothing
    elseif state.nextindex == 1
        return (iter.start, LuckyState(2, state.sequence))
    end
    result = state.sequence[state.nextindex]
    newsequence = Vector{Int}()
    for (i, el) in enumerate(state.sequence)
        if i % result != 0
            push!(newsequence, el)
        end
    end
    (result, LuckyState(state.nextindex + 1, newsequence))
end

function luckyindex(j, wanteven, k=0)
    topindex = max(j, k) + 4
    luck = Lucky(wanteven, topindex * 20)
    iter_result = iterate(luck)
    while iter_result != nothing
        (elem, state) = iter_result
        iter_result = iterate(luck, state)
        if iter_result != nothing && iter_result[2].nextindex > topindex
            return iter_result[2].sequence[k > j ? (j:k) : j]
        end
    end
    throw("Index $j out of range for nmax of $(luck.nmax).")
end

function luckyrange(j, k, wanteven)
    topvalue = max(j, k)
    luck = Lucky(wanteven, topvalue + 1)
    iter_result = iterate(luck)
    (elem, state) = iter_result # save next to last result
    while iter_result != nothing
        (elem, state) = iter_result
        iter_result = iterate(luck, state)
    end
    filter(x -> (j <= x <= k), state.sequence)
end

function helpdisplay(exitlevel=1)
    println("\n", PROGRAM_FILE, " j [-][k] [lucky|evenLucky]")
    println("\tj: index wanted or a starting point (index or value)",
            "\n\tk: optional ending point (index), \n\t-k: optional ending point (value)\n")
    helpstring =
""" | Argument(s)        |    What is printed                                  |
 |--------------------------------------------------------------------------|
 | j                  |  jth lucky number (required argument)               |
 | j , lucky          |  jth lucky number                                   |
 | j , evenLucky      |  jth even lucky number                              |
 | j  k               |  jth through kth (inclusive) lucky numbers          |
 | j  k  lucky        |  jth through kth (inclusive) lucky numbers          |
 | j  k  evenLucky    |  jth through kth (inclusive) even lucky numbers     |
 | j  -k              |  all lucky numbers in the value range [m, |k|]      |
 | j  -k  lucky       |  all lucky numbers in the value range [m, |k|]      |
 | j  -k  evenLucky   |  all even lucky numbers in the value range [m, |k|] |
 |--------------------------------------------------------------------------|\n\n"""

    println(helpstring)
    exit(exitlevel)
end

function parsecommandline()
    comma = false
    evenLucky = false
    range = false
    j = k = 0
    if length(ARGS) < 1
        helpdisplay()
    end
    for (pos, arg) in enumerate(ARGS)
        if pos == 1
            j = tryparse(Int, arg)
            if j == nothing
                println("The first argument must be a positive integer.\n")
                helpdisplay()
            end
        elseif pos == 2 || (pos == 3 && comma)
            k = tryparse(Int, arg)
            if k == nothing
                k = 0
                if arg == ","
                    comma = true
                    continue
                elseif arg == "lucky"
                    continue
                elseif arg == "evenLucky"
                    evenLucky = true
                elseif compare(Hamming(), arg, "lucky") > 0.4 || compare(Hamming(), arg, "evenLucky") > 0.4
                    println("Did you misspell \"lucky\" or \"evenLucky\"? Check capitalization.\n")
                    helpdisplay()
                else
                    helpdisplay()
                end
            elseif k < 0
                k = -k
                range = true
            end
        elseif pos == 3 || pos == 4 && comma
            if arg == ","
                comma = true
                continue
            elseif arg == "lucky"
                continue
            elseif arg == "evenLucky"
                evenLucky = true
            elseif compare(Hamming(), arg, "lucky") > 0.1 || compare(Hamming(), arg, "evenLucky") > 0.1
                println("Did you misspell "\lucky\" or "\evenLucky\"?\n\n")
                helpdisplay()
            else
                helpdisplay()
            end
        elseif arg == "lucky"
                continue
        elseif arg == "evenLucky"
                evenLucky = true
        else
            println("Too many arguments.\n")
            helpdisplay()
        end
    end
    (j, k, evenLucky, range)
end

function runopts()
    (j, k, evenLucky, range) = parsecommandline()
    if j < 1 || (k != 0 && j >= k)
        throw("Lucky number integer parameters out of range: $(typeof(j)), $j, $(typeof(k)), $k")
    end
    if range
        println(luckyrange(j, k, evenLucky))
    else
        println(luckyindex(j, evenLucky, k))
    end
end

runopts()

{{output}}


> julia luckymath.jl 1 20
[1, 3, 7, 9, 13, 15, 21, 25, 31, 33, 37, 43, 49, 51, 63, 67, 69, 73, 75, 79]
> julia luckymath.jl 1 20 evenLucky
[2, 4, 6, 10, 12, 18, 20, 22, 26, 34, 36, 42, 44, 50, 52, 54, 58, 68, 70, 76]
> julia luckymath.jl 6000 -6100
[6009, 6019, 6031, 6049, 6055, 6061, 6079, 6093]
> julia luckymath.jl 6000 -6100 evenLucky
[6018, 6020, 6022, 6026, 6036, 6038, 6050, 6058, 6074, 6090, 6092]
> julia luckymath.jl 10000
115591
> julia luckymath.jl 10000 evenLucky
111842

Kotlin

// version 1.1.51

typealias IAE = IllegalArgumentException

val luckyOdd  = MutableList(100000) { it * 2 + 1 }
val luckyEven = MutableList(100000) { it * 2 + 2 }

fun filterLuckyOdd() {
    var n = 2
    while (n < luckyOdd.size) {
        val m = luckyOdd[n - 1]
        val end = (luckyOdd.size / m) * m - 1
        for (j in end downTo m - 1 step m) luckyOdd.removeAt(j)
        n++
    }
}

fun filterLuckyEven() {
    var n = 2
    while (n < luckyEven.size) {
        val m = luckyEven[n - 1]
        val end = (luckyEven.size / m) * m - 1
        for (j in end downTo m - 1 step m) luckyEven.removeAt(j)
        n++
    }
}

fun printSingle(j: Int, odd: Boolean) {
    if (odd) {
        if (j >= luckyOdd.size) throw IAE("Argument is too big")
        println("Lucky number $j = ${luckyOdd[j - 1]}")
    }
    else {
        if (j >= luckyEven.size) throw IAE("Argument is too big")
        println("Lucky even number $j = ${luckyEven[j - 1]}")
    }
}

fun printRange(j: Int, k: Int, odd: Boolean) {
    if (odd) {
        if (k >= luckyOdd.size) throw IAE("Argument is too big")
        println("Lucky numbers $j to $k are:\n${luckyOdd.drop(j - 1).take(k - j + 1)}")
    }
    else {
        if (k >= luckyEven.size) throw IAE("Argument is too big")
        println("Lucky even numbers $j to $k are:\n${luckyEven.drop(j - 1).take(k - j + 1)}")
    }
}

fun printBetween(j: Int, k: Int, odd: Boolean) {
    val range = mutableListOf<Int>()
    if (odd) {
        val max = luckyOdd[luckyOdd.lastIndex]
        if (j > max || k > max) {
            throw IAE("At least one argument is too big")
        }
        for (num in luckyOdd) {
            if (num < j) continue
            if (num > k) break
            range.add(num)
        }
        println("Lucky numbers between $j and $k are:\n$range")
    }
    else {
        val max = luckyEven[luckyEven.lastIndex]
        if (j > max || k > max) {
            throw IAE("At least one argument is too big")
        }
        for (num in luckyEven) {
            if (num < j) continue
            if (num > k) break
            range.add(num)
        }
        println("Lucky even numbers between $j and $k are:\n$range")
    }
}

fun main(args: Array<String>) {
    if (args.size !in 1..3) throw IAE("There must be between 1 and 3 command line arguments")
    filterLuckyOdd()
    filterLuckyEven()
    val j = args[0].toIntOrNull()
    if (j == null || j < 1) throw IAE("First argument must be a positive integer")
    if (args.size == 1) { printSingle(j, true); return }

    if (args.size == 2) {
        val k = args[1].toIntOrNull()
        if (k == null) throw IAE("Second argument must be an integer")
        if (k >= 0) {
            if (j > k) throw IAE("Second argument can't be less than first")
            printRange(j, k, true)
        }
        else {
           val l = -k
            if (j > l) throw IAE("The second argument can't be less in absolute value than first")
            printBetween(j, l, true)
        }
        return
    }

    var odd =
        if (args[2].toLowerCase() == "lucky") true
        else if (args[2].toLowerCase() == "evenlucky") false
        else throw IAE("Third argument is invalid")

    if (args[1] == ",") {
        printSingle(j, odd)
        return
    }

    val k = args[1].toIntOrNull()
    if (k == null) throw IAE("Second argument must be an integer or a comma")

    if (k >= 0) {
        if (j > k) throw IAE("Second argument can't be less than first")
        printRange(j, k, odd)
    }
    else {
        val l = -k
        if (j > l) throw IAE("The second argument can't be less in absolute value than first")
        printBetween(j, l, odd)
    }
}

{{out}}


$ java -jar lucky.jar 1 20
Lucky numbers 1 to 20 are:
[1, 3, 7, 9, 13, 15, 21, 25, 31, 33, 37, 43, 49, 51, 63, 67, 69, 73, 75, 79]

$ java -jar lucky.jar 1 20 evenLucky
Lucky even numbers 1 to 20 are:
[2, 4, 6, 10, 12, 18, 20, 22, 26, 34, 36, 42, 44, 50, 52, 54, 58, 68, 70, 76]

$ java -jar lucky.jar 6000 -6100
Lucky numbers between 6000 and 6100 are:
[6009, 6019, 6031, 6049, 6055, 6061, 6079, 6093]

$ java -jar lucky.jar 6000 -6100 evenLucky
Lucky even numbers between 6000 and 6100 are:
[6018, 6020, 6022, 6026, 6036, 6038, 6050, 6058, 6074, 6090, 6092]

$ java -jar lucky.jar 10000 , lucky
Lucky number 10000 = 115591

$ java -jar lucky.jar 10000 , evenLucky
Lucky even number 10000 = 111842

Perl

The module Perl6::GatherTake emulates the Perl 6 gather/take syntax, and allows us to access values from what acts (mostly) like a lazy list. {{trans|Perl 6}}

use Perl6::GatherTake;

sub luck {
my($a,$b) = @_;

gather {
    my $i = $b;
    my(@taken,@rotor,$j);

    take 0; # 0th index is a placeholder
    push @taken, take $a;

    while () {
        for ($j = 0; $j < @rotor; $j++) {
            --$rotor[$j] or last;
        }
        if ($j < @rotor) {
            $rotor[$j] = $taken[$j+1];
        }
        else {
            take $i;
            push @taken, $i;
            push @rotor, $i - @taken;
        }
        $i += 2;
    }
}
}

# fiddle with user input
$j = shift || usage();
$k = shift || ',';
$l = shift || 'lucky';
usage() unless $k =~ /,|-?\d+/;
usage() unless $l =~ /^(even)?lucky$/i;
sub usage { print "Args must be:  j [,|k|-k] [lucky|evenlucky]\n" and exit }

# seed the iterator
my $lucky = $l =~ /^l/i ? luck(1,3) : luck(2,4);

# access values from 'lazy' list
if ($k eq ',') {
    print $lucky->[$j]
} elsif ($k > $j) {
    print $lucky->[$_] . ' ' for $j..$k
} elsif ($k < 0) {
    while () { last if abs($k) < $lucky->[$i++] } # must first extend the array
    print join ' ', grep { $_ >= $j and $_ <= abs($k) } @$lucky
}

print "\n"

{{out}}

$ ./lucky
Args must be:  j [,|k|-k] [lucky|evenlucky]
$ ./lucky 20 , lucky
79
$ ./lucky 20 , evenlucky
76
$ ./lucky 1 20
1 3 7 9 13 15 21 25 31 33 37 43 49 51 63 67 69 73 75 79
$ ./lucky 1 20 evenlucky
2 4 6 10 12 18 20 22 26 34 36 42 44 50 52 54 58 68 70 76
$ ./lucky 6000 -6100
6009 6019 6031 6049 6055 6061 6079 6093
$ ./lucky 6000 -6100 evenLucky
6018 6020 6022 6026 6036 6038 6050 6058 6074 6090 6092
$ ./lucky 10000
115591
$ ./lucky 10000 , EVENLUCKY
111842

Perl 6

sub luck(\a,\b) {
    gather {
	my @taken = take a;
	my @rotor;
	my $i = b;

	loop {
	    loop (my $j = 0; $j < @rotor; $j++) {
		--@rotor[$j] or last;
	    }
	    if $j < @rotor {
		@rotor[$j] = @taken[$j+1];
	    }
	    else {
		push @taken, take $i;
		push @rotor, $i - @taken;
	    }
	    $i += 2;
	}
    }
}

constant @lucky = luck(1,3);
constant @evenlucky = luck(2,4);

subset Luck where m:i/^ 'even'? 'lucky' $/;

multi MAIN (Int $num where * > 0) {
    say @lucky[$num-1];
}

multi MAIN (Int $num where * > 0, ',', Luck $howlucky = 'lucky') {
    say @::(lc $howlucky)[$num-1];
}

multi MAIN (Int $first where * > 0, Int $last where * > 0, Luck $howlucky = 'lucky') {
    say @::(lc $howlucky)[$first-1 .. $last - 1];
}

multi MAIN (Int $min where * > 0, Int $neg-max where * < 0, Luck $howlucky = 'lucky') {
    say grep * >= $min, (@::(lc $howlucky) ...^ * > abs $neg-max);
}

{{out}}

$ ./lucky
Usage:
  ./lucky <num>
  ./lucky <num> , [<howlucky>]
  ./lucky <first> <last> [<howlucky>]
  ./lucky <min> <neg-max> [<howlucky>]
$ ./lucky 20 , lucky
79
$ ./lucky 20 , evenlucky
76
$ ./lucky 1 20
1 3 7 9 13 15 21 25 31 33 37 43 49 51 63 67 69 73 75 79
$ ./lucky 1 20 evenlucky
2 4 6 10 12 18 20 22 26 34 36 42 44 50 52 54 58 68 70 76
$ ./lucky 6000 -6100
6009 6019 6031 6049 6055 6061 6079 6093
$ ./lucky 6000 -6100 evenLucky
6018 6020 6022 6026 6036 6038 6050 6058 6074 6090 6092
$ ./lucky 10000
115591
$ ./lucky 10000 , EVENLUCKY
111842

Phix

constant luckyMax = 120000

sequence lucky

procedure filterLucky()
    integer n = 2
    while n<=length(lucky) do
        integer m = lucky[n],
                l = m-1
        for k=m+1 to length(lucky) do
            if mod(k,m)!=0 then
                l += 1
                lucky[l] = lucky[k]
            end if
        end for
        if l>=length(lucky) then exit end if
        lucky = lucky[1..l]
        n += 1
    end while
end procedure

constant helptxt = """
   argument(s)   |  what is displayed

### =================================

 j               |  jth lucky number
 j [,] lucky     |  jth lucky number
 j [,] evenLucky |  jth even lucky number
 j k             |  jth through kth (inclusive) lucky numbers
 j k lucky       |  jth through kth (inclusive) lucky numbers
 j k evenLucky   |  jth through kth (inclusive) even lucky numbers
 j -k            |  all lucky numbers in the range j to k
 j -k lucky      |  all lucky numbers in the range j to k
 j -k evenLucky  |  all even lucky numbers in the range j to k
"""

procedure fatal(string msg)
    puts(1,msg)
    puts(1,helptxt)
    {} = wait_key()
    abort(0)
end procedure

procedure main()
    sequence cl = command_line()
    integer j,k,l,m,n
    bool single = true, range = true, odd = true
    if length(cl)=2 then
--      fatal("at least one argument must be supplied") -- (if preferred)
        sequence tests = {"1 20",
                          "1 20 evenLucky",
                          "20 lucky",
                          "20 evenLucky",
                          "6000 -6100",
                          "6000 -6100 evenLucky",
                          "10000 lucky",
                          "10000 evenLucky"}
        -- (done this way to exercise the real command line handling)
        if cl[1]=cl[2] then                     -- (compiled)
            cl = cl[1..1]
        elsif platform()=WINDOWS then           -- (and interpreted)
            cl[1] = substitute(cl[1],"pw","p")  -- (pw.exe -> p.exe)
        end if
        for i=1 to length(cl) do
            if find(' ',cl[i]) then cl[i] = sprintf("\"%s\"",{cl[i]}) end if
        end for
        for t=1 to length(tests) do
            string cmd = join(append(cl,tests[t]))
--          printf(1,"running %s\n",{cmd})
            {} = system_exec(cmd)
        end for
        puts(1, "tests complete\n")
        {} = wait_key()
    else
        cl = cl[3..$] -- ({1,2} are {interperter,source} or {exe,exe})

        --
        -- Allow eg "lucky j , evenLucky" to be == "lucky j evenLucky"
        --
        if length(cl)=3 and cl[2]="," then cl[2..2] = {} end if

        for i=1 to length(cl) do
            string cli = cl[i]
            if cli[1]<='9' then     -- (includes '-')
                sequence d = scanf(cl[i],"%d")
                if length(d)!=1 then
                    fatal("unrecognised "&cli)
                end if
                if i>2 then
                    fatal("too many numbers")
                end if
                n = d[1][1]
                if i=1 then
                    if n<1 then
                        fatal("first argument must be a positive integer")
                    end if
                    j = n
                else
                    single = false
                    if n<0 then
                        range = false
                        n = -n
                    end if
                    if n<j then
                        fatal("second argument cannot be less than first")
                    end if
                    k = n
                end if
            else
                l = find(cli,{"lucky","evenLucky"})
                if l=0 then
                    fatal("unrecognised "&cli)
                end if
                if i!=length(cl) then
                    fatal(cli&" must be last parameter")
                end if
                odd = (l=1)
            end if
        end for

        lucky = tagset(luckyMax,2-odd,2)
        filterLucky()
        printf(1,"Output when args are %s\n",{join(cl)})
        string even = iff(odd?"":"even ")
        if single then
            if j>length(lucky) then
                fatal(sprintf("the argument, %d, is too big", j))
            end if
            printf(1,"Lucky %snumber %d = %d\n",{even,j, lucky[j]})
        elsif range then
            if k>length(lucky) then
                fatal(sprintf("the argument, %d, is too big", k))
            end if
            printf(1,"Lucky %snumbers %d to %d are: %s\n",{even,j,k,sprint(lucky[j..k])})
        else
            if j>lucky[$] then
                fatal("start of range is too big")
            elsif k>lucky[$] then
                fatal("end of range is too big")
            end if
            m = abs(binary_search(j,lucky))
            n = binary_search(k,lucky)
            if n<0 then n = -n-1 end if
            printf(1,"Lucky %snumbers between %d and %d are: %s\n", {even,j,k,sprint(lucky[m..n])})
        end if
    end if
end procedure
main()

{{out}}


Output when args are 1 20
Lucky numbers 1 to 20 are: {1,3,7,9,13,15,21,25,31,33,37,43,49,51,63,67,69,73,75,79}
Output when args are 1 20 evenLucky
Lucky even numbers 1 to 20 are: {2,4,6,10,12,18,20,22,26,34,36,42,44,50,52,54,58,68,70,76}
Output when args are 20 lucky
Lucky number 20 = 79
Output when args are 20 evenLucky
Lucky even number 20 = 76
Output when args are 6000 -6100
Lucky numbers between 6000 and 6100 are: {6009,6019,6031,6049,6055,6061,6079,6093}
Output when args are 6000 -6100 evenLucky
Lucky even numbers between 6000 and 6100 are: {6018,6020,6022,6026,6036,6038,6050,6058,6074,6090,6092}
Output when args are 10000 lucky
Lucky number 10000 = 115591
Output when args are 10000 evenLucky
Lucky even number 10000 = 111842
tests complete

PicoLisp

(off *Even)

(de nn (Lst N)
   (seek
      '((L)
         (when (car L) (=0 (dec 'N))) )
      Lst ) )

(de lucky (B)
   (let Lst (range (if *Even 2 1) B 2)
      (for A (cdr Lst)
         (for (L (nn Lst A) L (nn (cdr L) A))
            (set L) ) )
      (filter bool Lst) ) )

(argv . *Argv) # without validations
(when (= "evenLucky" (last *Argv)) (on *Even))
(setq *Lst (lucky 7000))
(let (A (format (car *Argv))  B (format (cadr *Argv)))
   (println
      (if (lt0 B)
         (filter '((N) (<= A N (abs B))) *Lst)
         (head B (nth *Lst A)) ) ) )

{{out}}

$ pil ./lucky.l 1 20
(1 3 7 9 13 15 21 25 31 33 37 43 49 51 63 67 69 73 75 79)
$ pil ./lucky.l 1 20 evenLucky
(2 4 6 10 12 18 20 22 26 34 36 42 44 50 52 54 58 68 70 76)
$ pil ./lucky.l 6000 -6100
(6009 6019 6031 6049 6055 6061 6079 6093)
$ pil ./lucky.l 6000 -6100 evenLucky
(6018 6020 6022 6026 6036 6038 6050 6058 6074 6090 6092)

Python

The generator

from __future__ import print_function

def lgen(even=False, nmax=1000000):
    start = 2 if even else 1
    n, lst = 1, list(range(start, nmax + 1, 2))
    lenlst = len(lst)
    yield lst[0]
    while n < lenlst and lst[n] < lenlst:
        yield lst[n]
        n, lst = n + 1, [j for i,j in enumerate(lst, 1) if i % lst[n]]
        lenlst = len(lst)
    # drain
    for i in lst[n:]:
        yield i

The argument handler

from itertools import islice
import sys, re

class ArgumentError(Exception):
    pass
def arghandler(argstring):
    match_obj = re.match( r"""(?mx)
    (?:
      (?P<SINGLE>
         (?: ^ (?P<SINGLEL> \d+ ) (?:  | \s , \s lucky ) \s* $ )
        |(?: ^ (?P<SINGLEE> \d+ ) (?:  | \s , \s evenLucky ) \s* $ )
      )
     |(?P<KTH>
         (?: ^ (?P<KTHL> \d+ \s \d+ ) (?:  | \s lucky ) \s* $ )
        |(?: ^ (?P<KTHE> \d+ \s \d+ ) (?:  | \s evenLucky ) \s* $ )
      )
     |(?P<RANGE>
         (?: ^ (?P<RANGEL> \d+ \s -\d+ ) (?:  | \s lucky ) \s* $ )
        |(?: ^ (?P<RANGEE> \d+ \s -\d+ ) (?:  | \s evenLucky ) \s* $ )
      )
    )""", argstring)

    if match_obj:
        # Retrieve group(s) by name
        SINGLEL = match_obj.group('SINGLEL')
        SINGLEE = match_obj.group('SINGLEE')
        KTHL = match_obj.group('KTHL')
        KTHE = match_obj.group('KTHE')
        RANGEL = match_obj.group('RANGEL')
        RANGEE = match_obj.group('RANGEE')
        if SINGLEL:
            j = int(SINGLEL)
            assert 0 < j < 10001, "Argument out of range"
            print("Single %i'th lucky number:" % j, end=' ')
            print( list(islice(lgen(), j-1, j))[0] )
        elif SINGLEE:
            j = int(SINGLEE)
            assert 0 < j < 10001, "Argument out of range"
            print("Single %i'th even lucky number:" % j, end=' ')
            print( list(islice(lgen(even=True), j-1, j))[0] )
        elif KTHL:
            j, k = [int(num) for num in KTHL.split()]
            assert 0 < j < 10001, "first argument out of range"
            assert 0 < k < 10001 and k > j, "second argument out of range"
            print("List of %i ... %i lucky numbers:" % (j, k), end=' ')
            for n, luck in enumerate(lgen(), 1):
                if n > k: break
                if n >=j: print(luck, end = ', ')
            print('')
        elif KTHE:
            j, k = [int(num) for num in KTHE.split()]
            assert 0 < j < 10001, "first argument out of range"
            assert 0 < k < 10001 and k > j, "second argument out of range"
            print("List of %i ... %i even lucky numbers:" % (j, k), end=' ')
            for n, luck in enumerate(lgen(even=True), 1):
                if n > k: break
                if n >=j: print(luck, end = ', ')
            print('')
        elif RANGEL:
            j, k = [int(num) for num in RANGEL.split()]
            assert 0 < j < 10001, "first argument out of range"
            assert 0 < -k < 10001 and -k > j, "second argument out of range"
            k = -k
            print("List of lucky numbers in the range %i ... %i :" % (j, k), end=' ')
            for n in lgen():
                if n > k: break
                if n >=j: print(n, end = ', ')
            print('')
        elif RANGEE:
            j, k = [int(num) for num in RANGEE.split()]
            assert 0 < j < 10001, "first argument out of range"
            assert 0 < -k < 10001 and -k > j, "second argument out of range"
            k = -k
            print("List of even lucky numbers in the range %i ... %i :" % (j, k), end=' ')
            for n in lgen(even=True):
                if n > k: break
                if n >=j: print(n, end = ', ')
            print('')
    else:
        raise ArgumentError('''

  Error Parsing Arguments!

  Expected Arguments of the form (where j and k are integers):

      j                #  Jth       lucky number
      j  ,      lucky  #  Jth       lucky number
      j  ,  evenLucky  #  Jth  even lucky number
                       #
      j  k             #  Jth  through  Kth (inclusive)       lucky numbers
      j  k      lucky  #  Jth  through  Kth (inclusive)       lucky numbers
      j  k  evenLucky  #  Jth  through  Kth (inclusive)  even lucky numbers
                       #
      j -k             #  all       lucky numbers in the range  j --? |k|
      j -k      lucky  #  all       lucky numbers in the range  j --? |k|
      j -k  evenLucky  #  all  even lucky numbers in the range  j --? |k|
        ''')

if __name__ == '__main__':
    arghandler(' '.join(sys.argv[1:]))

{{out}}

# Output when arguments are: 1 20 lucky
List of 1 ... 20 lucky numbers: 1, 3, 7, 9, 13, 15, 21, 25, 31, 33, 37, 43, 49, 51, 63, 67, 69, 73, 75, 79,
# Output when arguments are: 1 20 evenLucky
List of 1 ... 20 even lucky numbers: 2, 4, 6, 10, 12, 18, 20, 22, 26, 34, 36, 42, 44, 50, 52, 54, 58, 68, 70, 76,
# Output when arguments are: 6000 -6100 lucky
List of lucky numbers in the range 6000 ... 6100 : 6009, 6019, 6031, 6049, 6055, 6061, 6079, 6093,
# Output when arguments are: 6000 -6100 evenLucky
List of even lucky numbers in the range 6000 ... 6100 : 6018, 6020, 6022, 6026, 6036, 6038, 6050, 6058, 6074, 6090, 6092,
# Output when arguments are: 10000
Single 10000'th lucky number: 115591
# Output when arguments are: 10000 , evenLucky
Single 10000'th even lucky number: 111842

REXX

This REXX version does extra error checking for the arguments.

/*REXX program displays  lucky  or  evenLucky  integers   (numbers  or  a number range).*/
parse arg bot top func _ .                       /*obtain required & optional arguments.*/
if func==''  then func='lucky'                   /*Not specified?  Then use the default.*/
s=left('s', bot\==top  &  top\==",")             /*plural results (or maybe not plural).*/
say func  'number's":"   bot  top   '───►'   $lucky(bot, top, func, _)
exit                                             /*stick a fork in it,  we're all done. */
/*──────────────────────────────────────────────────────────────────────────────────────*/
$lucky: arg x,y,f,?;  if y=='' | y==","  then y=x        /*obtain some arguments; set Y.*/
        #=0;        $=;      ny=y<0                      /*set variable NOY: value range*/
        if f==''  then f='LUCKY';  lucky= (f=="LUCKY")   /*assume  LUCKY  if omitted.   */
        if f\=='LUCKY' & f\=='EVENLUCKY'  then return  'function not valid: '     f
        if arg()>3  &  ?\=''      then return  "too many arguments entered: "     ?
        if x=''                   then return  "1st argument is missing."
        if x<1                    then return  "1st argument isn't a positive integer: " x
        if \datatype(x,'W')       then return  "1st argument isn't an integer: "  x
        if \datatype(y,'W')       then return  "2nd argument isn't an integer: "  y
        if x>ay                   then return  "2nd argument is less than 1st arg."
        ay=abs(y); yL=ay; if y>0  then yL=y*10+y+y       /*adjust the upper  Y  limit.  */
                                                         /* [↓]  build LUCKY | EVENLUCKY*/
            do j=1  until j>=yL                          /*construct list pos. integers.*/
            if j//2==(\lucky)  then iterate              /*EVENLUCKY? Use only even ints*/

            if lucky  then if (j+1)//6==0  then iterate  /*prune       if  mod 6 ≡ zero.*/
                                           else nop      /*balance the   IF-THEN  logic.*/
                      else if  j   //8==0  then iterate  /*prune next  if  mod 8 ≡ zero.*/
            #=#+1                                        /*bump the counter of numbers. */
            $=$ j                                        /*append integer to the $ list.*/
            end   /*j*/
        q=0
            do p=3  until  q=='';     q=word($,p)        /*start to prune  integer list.*/
            if q>#  then leave                           /*if integer is too large, stop*/
                               do j=#%q*q  by -q  to q   /*elide every  Qth  integer.   */
                               $=delword($, j, 1)        /*delete a particular number.  */
                               #=#-1                     /*decrease the integer count.  */
                               end   /*j*/               /*delete from the right side.  */
            end   /*p*/
        @.=
                  do k=1; parse var $ q $;  if q==''  then leave;  @.k=q;  end  /*k*/
        @.0=k-1
                  do m=1  for #                          /*restrict the found integers. */
                  if (\ny  &  (m<x  |  m>ay))  |  (ny  &  (@.m<x | @.m>ay))  then @.m=
                  end   /*m*/                            /* [↑]  a list of #s or a range*/
        _=
                  do b=1  for @.0; _=_ @.b; end  /*b*/   /*construct a list of integers.*/
        return space(_)                                  /*remove superfluous blanks.   */

'''output''' when the input is: 1 20 lucky 


lucky numbers: 1 20 ───► 1 3 7 9 13 15 21 25 31 33 37 43 49 51 63 67 69 73 75 79

'''output''' when the input is: 1 20 evenLucky 


evenLucky numbers: 1 20 ───► 2 4 6 10 12 18 20 22 26 34 36 42 44 50 52 54 58 68 70 76

'''output''' when the input is: 6000 -6100 lucky


lucky numbers: 6000 -6100 ───► 6009 6019 6031 6049 6055 6061 6079 6093

'''output''' when the input is: 6000 -6100 venLucky


evenLucky numbers: 6000 -6100 ───► 6018 6020 6022 6026 6036 6038 6050 6058 6074 6090 6092

'''output''' when the input is: 10000 


lucky number: 10000 ───► 115591

'''output''' when the input is: 10000 , evenLucky 


evenLucky number: 10000 ───► 111842

Ring


# Project : Lucky and even lucky numbers

lucky = list(50)
dellucky = []
for n = 1 to 50
     lucky[n] = 2*n-1
next
see "the first 20 lucky numbers:" + nl
luckynumbers(lucky)
showarray(lucky)
see nl

lucky = list(50)
dellucky = []
for n = 1 to 50
     lucky[n] = 2*n
next
see "the first 20 even lucky numbers:" + nl
luckynumbers(lucky)
showarray(lucky)
see nl

lucky = list(20000)
dellucky = []
for n = 1 to 10000
     lucky[n] = 2*n-1
next
see "lucky numbers between 6,000 and 6,100:" + nl
luckynumbers2(lucky)
showarray2(lucky)
see nl

lucky = list(20000)
dellucky = []
for n = 1 to 10000
     lucky[n] = 2*n
next
see "even lucky numbers between 6,000 and 6,100:" + nl
luckynumbers2(lucky)
showarray2(lucky)
see nl

func luckynumbers(lucky)
      for n = 2 to len(lucky)
          dellucky = []
          for m = lucky[n] to len(lucky) step lucky[n]
              add(dellucky, m)
          next
          for p = len(dellucky)  to 1 step -1
              del(lucky, dellucky[p])
          next
      next

func luckynumbers2(lucky)
      for n = 2 to len(lucky)
          dellucky = []
          for m = lucky[n] to len(lucky) step lucky[n]
              add(dellucky, m)
          next
          for p = len(dellucky)  to 1 step -1
              del(lucky, dellucky[p])
          next
          if lucky[n] >= 6100
             exit
          ok
next

func showarray(vect)
      see "["
      svect = ""
      for n = 1 to 20
          svect = svect + vect[n] + ", "
      next
      svect = left(svect, len(svect) - 2)
      see svect
      see "]" + nl

func showarray2(vect)
      see "["
      svect = ""
      for n = 1 to len(vect)
          if vect[n] >= 6000 and vect[n] <= 6100
             svect = svect + vect[n] + ", "
          ok
      next
      svect = left(svect, len(svect) - 2)
      see svect
      see "]" + nl

Output:


the first 20 lucky numbers:
[1, 3, 7, 9, 13, 15, 21, 25, 31, 33, 37, 43, 49, 51, 63, 67, 69, 73, 75, 79]

the first 20 even lucky numbers:
[2, 4, 6, 10, 12, 18, 20, 22, 26, 34, 36, 42, 44, 50, 52, 54, 58, 68, 70, 76]

lucky numbers between 6,000 and 6,100:
[6009, 6019, 6031, 6049, 6055, 6061, 6079, 6093]

even lucky numbers between 6,000 and 6,100:
[6018, 6020, 6022, 6026, 6036, 6038, 6050, 6058, 6074, 6090, 6092]

Ruby

{{trans|Python}}

def generator(even=false, nmax=1000000)
  start = even ? 2 : 1
  Enumerator.new do |y|
    n = 1
    ary = [0] + (start..nmax).step(2).to_a      # adds [0] to revise the 0 beginnings.
    y << ary[n]
    while (m = ary[n+=1]) < ary.size
      y << m
      (m...ary.size).step(m){|i| ary[i]=nil}
      ary.compact!                              # remove nil
    end
    # drain
    ary[n..-1].each{|i| y << i}
    raise StopIteration
  end
end

def lucky(argv)
  j, k = argv[0].to_i, argv[1].to_i
  mode = /even/i=~argv[2] ? :'even lucky' : :lucky
  seq = generator(mode == :'even lucky')
  ord = ->(n){"#{n}#{(n%100).between?(11,19) ? 'th' : %w[th st nd rd th th th th th th][n%10]}"}
  if k.zero?
    puts "#{ord[j]} #{mode} number: #{seq.take(j).last}"
  elsif 0 < k
    puts "#{ord[j]} through #{ord[k]} (inclusive) #{mode} numbers",
         "  #{seq.take(k)[j-1..-1]}"
  else
    k = -k
    ary = []
    loop do
      case num=seq.next
      when 1...j
      when j..k  then ary << num
      else break
      end
    end
    puts "all #{mode} numbers in the range #{j}..#{k}",
         "  #{ary}"
  end
end

if __FILE__ == $0
  lucky(ARGV)
end

{{out}}


C:\>ruby lucky.rb 1 20
1st through 20th (inclusive) lucky numbers
  [1, 3, 7, 9, 13, 15, 21, 25, 31, 33, 37, 43, 49, 51, 63, 67, 69, 73, 75, 79]

C:\>ruby lucky.rb 1 20 evenLucky
1st through 20th (inclusive) even lucky numbers
  [2, 4, 6, 10, 12, 18, 20, 22, 26, 34, 36, 42, 44, 50, 52, 54, 58, 68, 70, 76]

C:\>ruby lucky.rb 6000 -6100 Lucky
all lucky numbers in the range 6000..6100
  [6009, 6019, 6031, 6049, 6055, 6061, 6079, 6093]

C:\>ruby lucky.rb 6000 -6100 evenLucky
all even lucky numbers in the range 6000..6100
  [6018, 6020, 6022, 6026, 6036, 6038, 6050, 6058, 6074, 6090, 6092]

C:\>ruby lucky.rb 10000
10000th lucky number: 115591

C:\>ruby lucky.rb 10000 , EVENLUCKY
10000th even lucky number: 111842

Swift

{{trans|Python}}

The lucky numbers sequence:

struct LuckyNumbers : Sequence, IteratorProtocol {
  let even: Bool
  let through: Int

  private var drainI = 0
  private var n = 0
  private var lst: [Int]

  init(even: Bool = false, through: Int = 1_000_000) {
    self.even = even
    self.through = through
    self.lst = Array(stride(from: even ? 2 : 1, through: through, by: 2))
  }

  mutating func next() -> Int? {
    guard n != 0 else {
      defer { n += 1 }

      return lst[0]
    }

    while n < lst.count && lst[n] < lst.count {
      let retVal = lst[n]

      lst = lst.enumerated().filter({ ($0.offset + 1) % lst[n] != 0  }).map({ $0.element })
      n += 1

      return retVal
    }

    if drainI == 0 {
      lst = Array(lst.dropFirst(n))
    }

    while drainI < lst.count {
      defer { drainI += 1 }

      return lst[drainI]
    }

    return nil
  }
}

The main file:

let args = Array(CommandLine.arguments.dropFirst())

guard let sj = args.first, let j = Int(sj), j > 0, j <= 10_000 else {
  fatalError("Incorrect j")
}

func evenString(_ even: Bool) -> String {
  return even ? "even" : ""
}

func jLuckyNumber(_ j: Int, even: Bool) {
  print("The \(j)th \(evenString(even)) lucky number is \(Array(LuckyNumbers(even: even))[j-1..<j].first!)")
}

func luckyNumbersKth(j: Int, k: Int, even: Bool) {
  print("List of \(j) ... \(k) \(evenString(even)) lucky numbers: ", terminator: "")

  for (offset, luck) in LuckyNumbers(even: even).lazy.enumerated() {
    guard offset + 1 <= k else { break }

    if offset + 1 >= j {
      print(luck, terminator: ", ")
    }
  }

  print()
}

func luckyNumbersRange(j: Int, k: Int, even: Bool) {
  print("List of \(evenString(even)) lucky numbers in the range \(j) ... \(-k): ", terminator: "")

  for lucky in LuckyNumbers(even: even).lazy {
    guard lucky <= -k else { break }

    if lucky >= j {
      print(lucky, terminator: ", ")
    }
  }

  print()
}

switch args.count {
case 1:
  jLuckyNumber(j, even: false)
case 2:
  switch Int(args.last!) {
  case let k? where k > 0 && k <= 10_000 && k > j:
    luckyNumbersKth(j: j, k: k, even: false)
  case let k? where k < 0 && -k > j:
    luckyNumbersRange(j: j, k: k, even: false)
  case _:
    fatalError("Bad args")
  }
case 3:
  switch (Int(args[1]), args.last!) {
  case (nil, "lucky"):
    jLuckyNumber(j, even: false)
  case (nil, "evenLucky"):
    jLuckyNumber(j, even: true)
  case let (k?, "lucky") where k > 0 && k <= 10_000 && k > j:
    luckyNumbersKth(j: j, k: k, even: false)
  case let (k?, "evenLucky") where k > 0 && k <= 10_000 && k > j:
    luckyNumbersKth(j: j, k: k, even: true)
  case let (k?, "lucky") where k < 0 && -k > j:
    luckyNumbersRange(j: j, k: k, even: false)
  case let (k?, "evenLucky") where k < 0 && -k > j:
    luckyNumbersRange(j: j, k: k, even: true)
  case _:
    fatalError("Bad args")
  }
case _:
  fatalError()
}

{{out}}

$ ./main 1 20 lucky
List of 1 ... 20  lucky numbers: 1, 3, 7, 9, 13, 15, 21, 25, 31, 33, 37, 43, 49, 51, 63, 67, 69, 73, 75, 79,
$ ./main 1 20 evenLucky
List of 1 ... 20 even lucky numbers: 2, 4, 6, 10, 12, 18, 20, 22, 26, 34, 36, 42, 44, 50, 52, 54, 58, 68, 70, 76,
$ ./main 6000 -6100 lucky
List of  lucky numbers in the range 6000 ... 6100: 6009, 6019, 6031, 6049, 6055, 6061, 6079, 6093,
$ ./main 6000 -6100 evenLucky
List of even lucky numbers in the range 6000 ... 6100: 6018, 6020, 6022, 6026, 6036, 6038, 6050, 6058, 6074, 6090, 6092,
$ ./main 10000
The 10000th  lucky number is 115591
$ ./main 10000 , evenLucky
The 10000th even lucky number is 111842

Tcl

{{works with|Tcl|8.6}} {{trans|Python}}

#!/usr/bin/env tclsh8.6
package require Tcl 8.6

proc lgen {{even false} {nmax 200000}} {
    coroutine lgen.[incr ::lgen] apply {{start nmax} {
	set n 1
	for {set i $start} {$i <= $nmax+1} {incr i 2} {lappend lst $i}
	yield [info coroutine]
	yield [lindex $lst 0]
	while {$n < [llength $lst] && [lindex $lst $n] < [llength $lst]} {
	    yield [lindex $lst $n]
	    set lst [set i 0;lmap j $lst {
		if {[incr i] % [lindex $lst $n]} {set j} else continue
	    }]
	    incr n
	}
	foreach i [lrange $lst $n end] {
	    yield $i
	}
    }} [expr {$even ? 2 : 1}] $nmax
}

proc collectIndices {generator from to} {
    set result {}
    for {set i 0} {$i <= $to} {incr i} {
	set n [$generator]
	if {$i >= $from} {lappend result $n}
    }
    rename $generator {}
    return $result
}
proc collectValues {generator from to} {
    set result {}
    while 1 {
	set n [$generator]
	if {$n > $to} break
	if {$n >= $from} {lappend result $n}
    }
    rename $generator {}
    return $result
}

if {$argc<1||$argc>3} {
    puts stderr "wrong # args: should be \"$argv0 from ?to? ?evenOdd?\""
    exit 1
}
lassign $argv from to evenOdd
if {$argc < 3} {set evenOdd lucky}
if {$argc < 2} {set to ,}
if {![string is integer -strict $from] || $from < 1} {
    puts stderr "\"from\" must be positive integer"
    exit 1
} elseif {$to ne "," && (![string is integer -strict $to] || $to == 0)} {
    puts stderr "\"to\" must be positive integer or comma"
    exit 1
} elseif {[set evenOdd [string tolower $evenOdd]] ni {lucky evenlucky}} {
    puts stderr "\"evenOdd\" must be \"lucky\" or \"evenLucky\""
    exit 1
}
set l [lgen [expr {$evenOdd eq "evenlucky"}]]
set evenOdd [lindex {"lucky" "even lucky"} [expr {$evenOdd eq "evenlucky"}]]
if {$to eq ","} {
    puts "$from'th $evenOdd number = [collectIndices $l [incr from -1] $from]"
} elseif {$to < 0} {
    set to [expr {-$to}]
    puts "all $evenOdd numbers from $from to $to: [join [collectValues $l $from $to] ,]"
} else {
    puts "$from'th to $to'th $evenOdd numbers: [join [collectIndices $l [incr from -1] [incr to -1]] ,]"
}

{{out}}


bash$ lucky.tcl 1 20
1'th to 20'th lucky numbers: 1,3,7,9,13,15,21,25,31,33,37,43,49,51,63,67,69,73,75,79
bash$ lucky.tcl 1 20 evenLucky
1'th to 20'th even lucky numbers: 2,4,6,10,12,18,20,22,26,34,36,42,44,50,52,54,58,68,70,76
bash$ lucky.tcl 6000 -6100
all lucky numbers from 6000 to 6100: 6009,6019,6031,6049,6055,6061,6079,6093
bash$ lucky.tcl 6000 -6100 evenLucky
all even lucky numbers from 6000 to 6100: 6018,6020,6022,6026,6036,6038,6050,6058,6074,6090,6092
bash$ lucky.tcl 10000
10000'th lucky number = 115591
bash$ lucky.tcl 10000 , evenLucky
10000'th even lucky number = 111842

zkl

The lucky number generator works by chaining filters to a even or odd infinite sequence. So it acts like a sieve as each starting number percolates through the filters. It also means there are lots and lots of filters, which doesn't scale well but works for the examples.

fcn lgen(a){
   ns,idx:=[a..*,2],2;
   vm.yield(ns.next());
   while(1){
      n:=ns.next();
      vm.yield(n);
      ns=ns.tweak(skipper.fp1(n,Ref(idx+=1)));  // tack on another filter
   }
}
fcn skipper(n,skp,cnt){ z:=cnt.inc(); if(z%skp==0) Void.Skip else n  }

The command line is a bit funky (by Unix standards) so we just hard code it and use exceptions (such as trying to convert "foo" to int) to show the options.

cmdLineArgs,j,k,start:=vm.arglist,Void,Void,1;
try{
   j=cmdLineArgs[0].toInt();
   na:=cmdLineArgs.len();
   if(na>1){
      if(cmdLineArgs[1]==",")
         start=cmdLineArgs[2][0].toLower()=="e" and 2 or 1;
      else{
	 k=cmdLineArgs[1].toInt();
	 if(na>2)
	    start=cmdLineArgs[2][0].toLower()=="e" and 2 or 1;
      }
   }
}catch{
   fcn options{
      "args: j | j , [even]lucky | j k [even]lucky | j -k [even]lucky"
      .println();
      System.exit(1);
   }()
}
luckies:=Utils.Generator(lgen,start);
try{
   if(Void==k) luckies.drop(j-1).next().println();
   else{
      if(k>0) luckies.drop(j-1).walk(k-j+1).println();
      else{ k=-k;
	 while((n:=luckies.next())<j){}
	 luckies.push(n);
	 luckies.pump(List,'wrap(n){ n<=k and n or Void.Stop }).println();
      }
   }
}catch(TheEnd){ options() }

{{out}}


$ zkl lucky
args: j | j , [even]lucky | j k [even]lucky | j -k [even]lucky
$ zkl lucky 1 20
L(1,3,7,9,13,15,21,25,31,33,37,43,49,51,63,67,69,73,75,79)
$ zkl lucky 1 20 evenLucky
L(2,4,6,10,12,18,20,22,26,34,36,42,44,50,52,54,58,68,70,76)
$ zkl lucky 6000 -6100
L(6009,6019,6031,6049,6055,6061,6079,6093)
$ zkl lucky 6000 -6100 Even
L(6018,6020,6022,6026,6036,6038,6050,6058,6074,6090,6092)
$ zkl lucky 10000
115591
$ zkl lucky 10000 , evenLucky
111842
$ zkl lucky 6000 -5000
L()
$ zkl lucky 4 2
args: j | j , [even]lucky | j k [even]lucky | j -k [even]lucky