Primality testing 28511^31524-31524^28511 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 5
Running N-1 test using base 13
Running N+1 test using discriminant 23, base 6+sqrt(23)
Calling N-1 BLS with factored part 0.00% and helper 0.00% (0.02% proof)
28511^31524-31524^28511 is Fermat and Lucas PRP! (756.4857s+0.0024s)

Sieved with xyyxsieve

To be completed...