I'd like it to go as fast as possible and not restrict myself to a certain size, if possible. Doing some tests on my 400mhz laptop, it takes about 5 minutes to create a number with 10 million digits. I haven't tried incrementing it at all. 
use Math::BigInt;

my $i = 10000000;

while (1) {
    my $num = Math::BigInt->new('1' . '0' x $i);
    print $i . "\n";
    $i++;
}

[download]
Update: As a side note, Math::BigInt has some really weird memory usage. It jumps around like crazy, but my first test used about 50 megabytes on average while the second uses about 160.

In reply to Re^2: Incrementing a large number without Math::BigInt by Cap'n Steve
in thread Incrementing a large number without Math::BigInt by Cap'n Steve

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