1st PRP for 2^n-315431.

Sieved to P=200G.

Primality testing 2^53554-315431 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 193
Running N+1 test using discriminant 227, base 10+sqrt(227)
Running N+1 test using discriminant 227, base 13+sqrt(227)
Calling N+1 BLS with factored part 0.03% and helper 0.01% (0.10% proof)
2^53554-315431 is Fermat and Lucas PRP! (306.5720s+0.0053s)

To be completed...