Primality testing 31912^33975-33975^31912 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Running N+1 test using discriminant 7, base 6+sqrt(7)
Calling N+1 BLS with factored part 0.00% and helper 0.00% (0.01% proof)
31912^33975-33975^31912 is Fermat and Lucas PRP! (962.8295s+0.0028s)

Sieved with xyyxsieve

To be completed...