Primality testing 25771^26948-26948^25771 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Running N+1 test using discriminant 13, base 1+sqrt(13)
Calling N-1 BLS with factored part 0.00% and helper 0.00% (0.01% proof)
25771^26948-26948^25771 is Fermat and Lucas PRP! (964.5533s+0.0041s)

Sieved with xyyxsieve

To be completed...