1st PRP for 2^n-318973.

Sieved to P=200G.

Primality testing 2^105685-318973 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 31
Running N-1 test using base 43
Running N+1 test using discriminant 59, base 1+sqrt(59)
Calling N-1 BLS with factored part 0.01% and helper 0.00% (0.04% proof)
2^105685-318973 is Fermat and Lucas PRP! (619.0765s+0.0058s)

To be completed...