1st PRP for 2^n-15997.

Sieved to P=200G.

Primality testing 2^86199-15997 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 11
Running N+1 test using discriminant 41, base 2+sqrt(41)
Calling N-1 BLS with factored part 0.02% and helper 0.01% (0.06% proof)
2^86199-15997 is Fermat and Lucas PRP! (397.3174s+0.0056s)

To be completed...