1st PRP for 31^n-25980

Sieved to P=10G

Primality testing 31^8637-25980 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 2
Running N-1 test using base 3
Running N-1 test using base 19
Running N-1 test using base 29
Running N+1 test using discriminant 43, base 1+sqrt(43)
Calling N+1 BLS with factored part 0.07% and helper 0.04% (0.26% proof)
31^8637-25980 is Fermat and Lucas PRP! (39.4521s+0.0014s)

To be completed...