1st PRP for 2^n-107741.

Sieved to P=200G.

Primality testing 2^84978-107741 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 5
Running N+1 test using discriminant 19, base 3+sqrt(19)
Calling N+1 BLS with factored part 0.03% and helper 0.02% (0.11% proof)
2^84978-107741 is Fermat and Lucas PRP! (353.0301s+0.0059s)

To be completed...