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#!/usr/bin/perl -s
use v5.16;
use Test2::V0;
use Math::Prime::Util qw(is_prime next_prime);
use List::Gen;
our ($tests, $examples, $verbose);
run_tests() if $tests || $examples; # does not return
die <<EOS unless @ARGV;
usage: $0 [-examples] [-tests] [N]
-examples
run the examples from the challenge
-tests
run some tests
N
print the first N "sexy prime pairs"
EOS
### Input and Output
sexy_prime_pairs()->map(sub {"(@$_)"})->say(shift);
### Implementation
sub sexy_prime_pairs {
iterate(sub {next_prime($_)})
->from(2)
->filter(sub {is_prime($_ + 6)})
->map(sub {[$_, $_ + 6]});
}
### Examples and tests
sub run_tests {
SKIP: {
skip "examples" unless $examples;
is sexy_prime_pairs()->while(sub {$_->[1] < 500})->apply,
[[5,11], [7,13], [11,17], [13,19], [17,23], [23,29], [31,37],
[37,43], [41,47], [47,53], [53,59], [61,67], [67,73],
[73,79], [83,89], [97,103], [101,107], [103,109], [107,113],
[131,137], [151,157], [157,163], [167,173], [173,179],
[191,197], [193,199], [223,229], [227,233], [233,239],
[251,257], [257,263], [263,269], [271,277], [277,283],
[307,313], [311,317], [331,337], [347,353], [353,359],
[367,373], [373,379], [383,389], [433,439], [443,449],
[457,463], [461,467]],
'example from Wiki';
}
SKIP: {
skip "tests" unless $tests;
}
done_testing;
exit;
}
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