1st PRP for 2^n-412843.

Sieved to P=200G.

Primality testing 2^84393-412843 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 2
Running N+1 test using discriminant 11, base 1+sqrt(11)
Calling N-1 BLS with factored part 0.04% and helper 0.03% (0.16% proof)
2^84393-412843 is Fermat and Lucas PRP! (345.9049s+0.0052s)

To be completed...