1st PRP for 2^n-304963.

Sieved to P=200G.

Primality testing 2^54953-304963 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 233
Running N+1 test using discriminant 7, base 1+sqrt(7)
Calling N-1 BLS with factored part 0.09% and helper 0.06% (0.34% proof)
2^54953-304963 is Fermat and Lucas PRP! (171.5009s+0.0048s)

To be completed...