Another first_pos function, for a projective prime and valid only in lines where it hits
Another first_pos function, for a projective prime and valid only in lines where it hits

mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs