Primality testing 25500^39173-39173^25500 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 29
Running N+1 test using discriminant 37, base 1+sqrt(37)
Calling N+1 BLS with factored part 0.00% and helper 0.00% (0.01% proof)
25500^39173-39173^25500 is Fermat and Lucas PRP! (2185.9065s+0.0040s)

Sieved with xyyxsieve

To be completed...