The purpose of this project is to make a prime number generator that offers many user adjustable settings and that is also very fast.

While there are other prime number generators that can still beat this one in speed, no other ones that I am aware of allow the level of adjustment of sieve size that this one does.

If you are running 64-bit Windows, make sure to download the 64-bit executable as it is faster than the 32-bit executable.


  • Calculate primes starting at 0 or 0+
  • Multiple output options - file, screen, none(time only), count(time & number of primes found)
  • Multithreaded - theoretically supports up to 4,294,967,295 threads

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