1st PRP for 2^n-265423.
Sieved to P=200G.
Primality testing 2^127917-265423 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 31
Running N+1 test using discriminant 41, base 12+sqrt(41)
Calling N+1 BLS with factored part 0.02% and helper 0.00% (0.06% proof)
2^127917-265423 is Fermat and Lucas PRP! (1727.3779s+0.0060s)
To be completed...