1st PRP for 2^n-395501.

Sieved to P=200G.

Primality testing 2^61898-395501 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 37
Running N+1 test using discriminant 73, base 3+sqrt(73)
Calling N-1 BLS with factored part 0.04% and helper 0.03% (0.14% proof)
2^61898-395501 is Fermat and Lucas PRP! (178.6924s+0.0053s)

To be completed...