Primality testing 26480^30517-30517^26480 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Running N-1 test using base 7
Running N-1 test using base 19
Running N+1 test using discriminant 29, base 2+sqrt(29)
Calling N-1 BLS with factored part 0.00% and helper 0.00% (0.02% proof)
26480^30517-30517^26480 is Fermat and Lucas PRP! (1922.2917s+0.0043s)

Sieved with xyyxsieve

To be completed...