primorial(negative)

[paul zimmermann]

       Dear Marco,

> Suggestions for the interface?

mpz_prime_t p;

mpz_prime_init_ui (p, 17); /* initializes p to 17 */

mpz_prime_next (p);     /* p <- next_prime(p) */

mpz_prime_clear (p);

We could access the current prime by:

mpz_prime_get_z (z, p);

Paul