My favorite prime number generator is the undocumented __next_prime(): https://github.com/llvm-mirror/libcxx/blob/78d6a7767ed57b50122a161b91f59f19c9bd0d19/src/

My favorite prime number generator is the undocumented __next_prime(): https://github.com/llvm-mirror/libcxx/blob/78d6a7767ed57b50122a161b91f59f19c9bd0d19/src/hash.cpp#L170 https://github.com/llvm-mirror/libcxx/blob/78d6a7767ed57b501... There is no good reason to use this one except in a code golf environment that includes all headers by default, which is where I learned about it.