1st PRP for 2^n-497501.

Sieved to P=200G.

Primality testing 2^75754-497501 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 139
Running N+1 test using discriminant 167, base 4+sqrt(167)
Calling N+1 BLS with factored part 0.07% and helper 0.02% (0.23% proof)
2^75754-497501 is Fermat and Lucas PRP! (391.3870s+0.0080s)

To be completed...