One other bug: 
        for (@primes) {
            last if $_ > $root;  # If you have checked bigger primes, 
+you don't want to go through all of them!
            print("$_ divides $num\n"), return 0 if ($num % $_ == 0);
        }

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In reply to Re^2: a close prime number by Roy Johnson
in thread a close prime number by Anonymous Monk

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