Hey, that looks pretty cool and I'll see what I can do to implement that, once I've worked out the math (it doesn't look too hard). In the meantime, here's a much faster version, easier to read version, based upon an article by merlyn.

#!/usr/bin/perl
use warnings;
use strict;
use Data::Dumper;

sub NEXT ($) { $_[0]->() }

sub prime_iterator {
    my $num = 0;
    sub {
        do {
            $num++;
        } until is_prime($num);
        return $num;
    }
}

sub is_prime {
    my $guess = shift;
    for (my $divisor = 2; $divisor * $divisor <= $guess; $divisor++) {
        return unless $guess % $divisor;
    }
    return 1;
}

my $prime = prime_iterator;
my @primes;
push @primes => NEXT $prime for (1 .. shift || 10);
print Dumper \@primes;
[download]

Cheers,
Ovid

Update: Here's a better "is_prime" function, based upon a code snippet provided in the link the greenback mentioned. This is twice as fast as the above function.

sub is_prime {
    my $guess = shift;
    # accidentally reversed next two lines. Thanks to petral for catch
+ing that :)
    return 1 if $guess == 2;
    return unless $guess > 2 and $guess % 2;

    my $max = 1 + int $guess ** .5;
    for ( my $divisor = 3; $divisor < $max; $divisor += 2 ) {
        return unless $guess % $divisor;
    }
    return 1;
}
[download]

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