Hi, mpz_t has the "int mpz_odd_p (mpz_t op)" function. What is the method for the mpz_class ? Same for even, size, sizeinbase ? Regards Cpm. -- __ __ __ (o_ | |__| | | "CPM est Christian P. M____." ('< /) |__ . | . | | . cp.momon@ocmland.org ,',)