Primality testing 26197^28502-28502^26197 [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)
26197^28502-28502^26197 is Fermat and Lucas PRP! (1332.1789s+0.0042s)

Sieved with xyyxsieve

To be completed...