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Here's the code I've used for this in the past. I believe it's fairly efficent. If you're going to use it like in the root node in this thread, it's best to check only odd numbers, as suggested by ichimunki.
#!usr/bin/perl -w use strict; sub prime { my $number = shift; my $d = 2; my $sqrt = sqrt $number; while(1) { if ($number%$d == 0) { return 0; } if ($d < $sqrt) { $d++; } else { return 1; } } } my $number = $ARGV[0]; print prime($number);

elusion : http://matt.diephouse.com


In reply to Re: Prime Number Finder by elusion
in thread Prime Number Finder by munchie

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