The search space can be trimmed: 
#!/usr/bin/perl

use strict;
use warnings;

my $max = shift // 999;
my $min = shift // 100;

my $best = 0;

I: for (my $i = $max; $i >= $min; $i--) {
 J: for (my $j = $max; $j >= $i; $j--) {
        my $prod = $i * $j;
        if ($prod <= $best) {
            last I if $j == $max;
            last J;
        }
        if ($prod == reverse $prod) {
            $best = $prod;
            print "$i x $j -> $prod\n";
            last J;
        }
    }
}
print "best: $best\n";

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In reply to Re: Largest palindrome number for a 3 digit product of 2 numbers by salva
in thread Largest palindrome number for a 3 digit product of 2 numbers by pr33

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