Primality testing 27868^33759-33759^27868 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Running N+1 test using discriminant 11, base 1+sqrt(11)
Calling N+1 BLS with factored part 0.02% and helper 0.01% (0.06% proof)
27868^33759-33759^27868 is Fermat and Lucas PRP! (1128.8729s+0.0032s)

Sieved with xyyxsieve

To be completed...