Primality testing 31861^37028-37028^31861 [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% (0.02% proof)
31861^37028-37028^31861 is Fermat and Lucas PRP! (1152.1018s+0.0031s)

Sieved with xyyxsieve

To be completed...