1st PRP for 2^n-271447.

Sieved to P=200G.

Primality testing 2^119551-271447 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 23
Running N+1 test using discriminant 31, base 3+sqrt(31)
Calling N-1 BLS with factored part 0.03% and helper 0.02% (0.12% proof)
2^119551-271447 is Fermat and Lucas PRP! (1491.9625s+0.0046s)

To be completed...