primesieve is a free software program and C/C++ library that generates primes
using a highly optimized sieve of Eratosthenes implementation. It counts the
primes below 10^10 in just 0.4 seconds on an Intel Core i7-6700 CPU
(4 x 3.4 GHz). primesieve can generate primes and prime k‑tuplets up to 2^64
