1st PRP for 2^n-12343.

Sieved to P=200G.

Primality testing 2^67917-12343 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 17
Running N+1 test using discriminant 79, base 3+sqrt(79)
Calling N+1 BLS with factored part 0.10% and helper 0.02% (0.31% proof)
2^67917-12343 is Fermat and Lucas PRP! (266.2211s+0.0051s)

To be completed...