Primality testing 31580^32209-32209^31580 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Running N+1 test using discriminant 11, base 1+sqrt(11)
Calling N+1 BLS with factored part 0.01% and helper 0.00% (0.04% proof)
31580^32209-32209^31580 is Fermat and Lucas PRP! (940.6479s+0.0036s)

Sieved with xyyxsieve

To be completed...