This is actually the quadratic sieve, not the number field sieve, for that you want http://www.math.ttu.edu/~cmonico/software/ggnfs/ http://www.math.ttu.edu/~cm

This is actually the quadratic sieve, not the number field sieve, for that you want http://www.math.ttu.edu/~cmonico/software/ggnfs/ http://www.math.ttu.edu/~cmonico/software/ggnfs/