1st PRP for 2^n-4327.

Sieved to P=200G.

Primality testing 2^58091-4327 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 19
Running N+1 test using discriminant 23, base 2+sqrt(23)
Calling N+1 BLS with factored part 0.04% and helper 0.04% (0.16% proof)
2^58091-4327 is Fermat and Lucas PRP! (186.0300s+0.0054s)

To be completed...