I, for the life of me, could not grasp the "length $_" concept (what it was testing for each entry), so we re-wrote it in a way that worked better for our comprehension.

use strict;
use warnings;
my @prime = (2); my $not_prime;
for my $i(3..100){
    $not_prime=0;
    for(@prime){
        next if int($i/$_)!=($i/$_);
        $not_prime=1;
    }
    push @prime, $i if $not_prime!=1;
}
print join "\n", @prime;

[download]


Thanks again for your help! (The next, last, and conditional-if's that you inadvertantly taught me are VERY welcomed pieces of information.)

In reply to Re^4: Primes. Again. by Andrew_Levenson
in thread Primes. Again. by Andrew_Levenson

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.