You may as well write 
for($i=$o; $i<=$e; $i++){

[download]
as 
print "2 is prime\n" if $o == 2;
$o++ if $o % 2;
for my $i ( $i=$o; $i<=$e; $i+=2 ){

[download]
That way you start on an odd number and account for the only even number which is prime. There is no need to check even numbers after 2.

In reply to (ichimunki) Re: Prime Number Finder by ichimunki
in thread Prime Number Finder by munchie

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