1st PRP for 15^n-255716

Sieved to P=10G

Primality testing 15^9567-255716 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 2
Running N+1 test using discriminant 7, base 1+sqrt(7)
Calling N-1 BLS with factored part 0.05% and helper 0.01% (0.15% proof)
15^9567-255716 is Fermat and Lucas PRP! (33.6720s+0.0017s)

To be completed...