Primality testing 26892^28063-28063^26892 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 5
Running N+1 test using discriminant 17, base 1+sqrt(17)
Calling N-1 BLS with factored part 0.00% and helper 0.00% (0.02% proof)
26892^28063-28063^26892 is Fermat and Lucas PRP! (622.9684s+0.0024s)

Sieved with xyyxsieve

To be completed...