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Old discussion, but I figure I'll throw in my attempt at calculating primes without modules, and using only recursive functions (no loops)
```#!/usr/bin/env perl

use strict;
use warnings;
use 5.010;

\$DB::deep = 500;
\$DB::deep = \$DB::deep; # Avoids silly 'used only once' warning

no warnings "recursion";

# Identify primes between ARG0 and ARG1

my (\$x, \$y, \$re_int, \$result);
my (\$prime, \$is_int);

\$x = \$ARGV[0];
\$y = \$ARGV[1];

\$is_int = sub {
my \$re_int = qr(^-?\d+\z);
my (\$x) = @_;
\$x =~ \$re_int
? 1
: 0;
};

\$prime = sub {
my ( \$x, \$y ) = @_;
if ( \$y > 1 ) {
given (\$x) {
when ( \$is_int->( \$x / \$y ) ) {
return 0;
}
default {
return \$prime->( \$x, \$y - 1 );
}
}
}
else { return 1; }
};

\$result = sub {
my ( \$x, \$y ) = @_;
if ( \$x <= \$y ) {
if ( \$prime->(\$x, \$x-1) ) {
say \$x;
}
\$result->( ( \$x + 1 ), \$y );
}
};

\$result->(\$x, \$y);
Originally posted the above to my blog.

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

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