Primality testing 28075^32844-32844^28075 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 13
Running N+1 test using discriminant 19, base 14+sqrt(19)
Calling N-1 BLS with factored part 0.01% and helper 0.00% (0.02% proof)
28075^32844-32844^28075 is Fermat and Lucas PRP! (728.2076s+0.0025s)

Sieved with xyyxsieve

To be completed...