Primality testing 27528^27937-27937^27528 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 5
Running N+1 test using discriminant 11, base 3+sqrt(11)
Calling N+1 BLS with factored part 0.01% and helper 0.00% (0.02% proof)
27528^27937-27937^27528 is Fermat and Lucas PRP! (566.2173s+0.0022s)

Sieved with xyyxsieve

To be completed...