1st PRP for 2^n-242999.

Sieved to P=200G.

Primality testing 2^121460-242999 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Running N+1 test using discriminant 7, base 1+sqrt(7)
Calling N+1 BLS with factored part 0.03% and helper 0.02% (0.10% proof)
2^121460-242999 is Fermat and Lucas PRP! (1563.8782s+0.0104s)

To be completed...