Primality testing 28736^31055-31055^28736 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Running N-1 test using base 11
Running N-1 test using base 13
Running N-1 test using base 23
Running N+1 test using discriminant 31, base 17+sqrt(31)
Calling N-1 BLS with factored part 0.00% and helper 0.00% (0.01% proof)
28736^31055-31055^28736 is Fermat and Lucas PRP! (1039.6771s+0.0021s)

Sieved with xyyxsieve

To be completed...