Running N-1 test using base 3
Running N+1 test using discriminant 7, base 1+sqrt(7)
Calling N+1 BLS with factored part 0.05% and helper 0.03% (0.19% proof)
(2^57131-1)/61481396117165983261035042726614288722959856631 is Fermat and Lucas PRP!

To be completed...