Primality testing 25531^27552-27552^25531 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 5
Running N-1 test using base 13
Running N+1 test using discriminant 31, base 1+sqrt(31)
Calling N-1 BLS with factored part 0.01% and helper 0.01% (0.03% proof)
25531^27552-27552^25531 is Fermat and Lucas PRP! (1182.6874s+0.0033s)

Sieved with xyyxsieve

To be completed...