1st PRP for 2^n-491891.

Sieved to P=200G.

Primality testing 2^64058-491891 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 73
Running N+1 test using discriminant 107, base 3+sqrt(107)
Calling N-1 BLS with factored part 0.03% and helper 0.02% (0.12% proof)
2^64058-491891 is Fermat and Lucas PRP! (182.2353s+0.0053s)

To be completed...