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#!/usr/bin/env perl
use strict;
use warnings;
use feature qw{ say signatures };
no warnings qw{ experimental::signatures };
use List::Util qw{sum};
say join "\n", perfect_numbers();
sub perfect_numbers {
my @numbers;
my $n = 0;
while ( scalar @numbers < 5 ) {
$n++;
next unless $n % 2 == 0; # they're all even, so this halves time
my @factors = factor($n);
my $sum = sum @factors;
push @numbers, $n if $sum eq $n;
}
return @numbers;
}
sub factor ( $n ) {
my @factors;
for my $i ( 1 .. $n - 1 ) {
push @factors, $i if $n % $i == 0;
}
return @factors;
}
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