It's your lucky day! I coded an unoptimized solution. This runs pretty quickly (<10sec) but you could really improve the factor subroutine.

my @numbers = (1 .. 10000); 
my %factor_hash = ();
my $number = 1;
my @perfect_numbers = ();
for $number (@numbers) 
{
    #do the factoring in a subroutine
    #store a string such as 1-2-4 for the factors of 4
    $factor_hash{$number} = factor($number);
}

#time to check for perfection
for $number (@numbers)
{
    my $sum_of_factors = 0;
    my @factors = split /-/, $factor_hash{$number};
    for my $factor (@factors)
    {
        $sum_of_factors+=$factor;
    }
    #a number is perfect if it equals half the sum of all factors
    # (because the number itself is a factor)
    if ($number == $sum_of_factors/2) 
    {
        print "$number is perfect\n";
        push @perfect_numbers, $number;
    }
}

sub factor
{
    my $factor_string = "";
    my $number = shift;
    
    for my $i ( 1 .. $number)
    {
        if (($number % $i) == 0)
        {
            $factor_string .= "-$i";
        }
    }
    return $factor_string;
}
#OUTPUT
#6 is perfect
#28 is perfect
#496 is perfect
#8128 is perfect

[download]

According to wikipedia the output is correct.

In reply to Re: finding perfect numbers by zek152
in thread finding perfect numbers by derpp

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