Download of PrimeGen 1.0 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. This free software for Mac OS X was originally developed by Bob Delaney. PrimeGen for Mac lies within Productivity Tools, more precisely Timekeeping.
From the developer:
PrimeGen is a Universal Cocoa application that uses the Miller-Rabin Test as implemented by Victor Shoup's NTL to generate probable primes. The length of the primes is only limited by available memory. This free application has a user friendly interface.
You may want to check out more software for Mac, such as Address Book Scrubber, Quote of the Day or Opera Clock, which might be similar to PrimeGen.
Debugging Tools