Math::Pari is the gold standard for number-theoretic things in perl. It isn't trivial to install, but it can do anything that is practical with prime numbers. Nothing matches it for speed and range.

It has functions for primality testing, n-th prime, next higher prime from a number, and lists of primes. It can factor up to 60 digits or so very quickly. All the numbers are promoted to multiple precision at need. The libPARI library is used.

After Compline,
Zaxo

In reply to Re: Math help: Finding Prime Numbers by Zaxo
in thread Math help: Finding Prime Numbers by Ovid

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