Primality testing 31987^36000-36000^31987 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 11
Running N+1 test using discriminant 29, base 4+sqrt(29)
Calling N-1 BLS with factored part 0.01% and helper 0.01% (0.03% proof)
31987^36000-36000^31987 is Fermat and Lucas PRP! (1023.5528s+0.0029s)

Sieved with xyyxsieve

To be completed...