Primality testing 31199^34764-34764^31199 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 5
Running N-1 test using base 7
Running N-1 test using base 13
Running N+1 test using discriminant 29, base 1+sqrt(29)
Calling N-1 BLS with factored part 0.01% and helper 0.00% (0.03% proof)
31199^34764-34764^31199 is Fermat and Lucas PRP! (1604.3404s+0.0027s)

Sieved with xyyxsieve

To be completed...