Primality testing 25671^27370-27370^25671 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Running N+1 test using discriminant 11, base 10+sqrt(11)
Calling N-1 BLS with factored part 0.01% and helper 0.00% (0.04% proof)
25671^27370-27370^25671 is Fermat and Lucas PRP! (874.8225s+0.0038s)

Sieved with xyyxsieve

To be completed...