use strict;
use warnings;
use 5.010;
my @n; my @p;
sub mk {
    my $l = shift;
    no warnings "redefine";
    *is=eval 'sub { ' . join(' && ', map('$_[0] % '.$_, grep $_*$_ <= 
+$n[-1], @p), <<'EOCODE');
($_[0] <= $l
    ? (push(@p, $_[0]), say($_[0]))
    : (unshift(@n, $_[0]), mk($p[-1]**2))
) }
EOCODE
}
@n=2..(shift//200);
mk(2);
is(shift @n) while @n;
[download]

---

---

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! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

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:
	&		&
	<		&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.