Primality testing 27520^32541-32541^27520 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Running N-1 test using base 7
Running N+1 test using discriminant 19, base 1+sqrt(19)
Calling N+1 BLS with factored part 0.01% and helper 0.00% (0.02% proof)
27520^32541-32541^27520 is Fermat and Lucas PRP! (971.3308s+0.0026s)

Sieved with xyyxsieve

To be completed...