Primality testing 2729^19638-19638^2729 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 5
Running N+1 test using discriminant 11, base 1+sqrt(11)
Calling N-1 BLS with factored part 0.00% and helper 0.00% (0.01% proof)
2729^19638-19638^2729 is Fermat and Lucas PRP! (213.3926s+0.0021s)

Sieved with xyyxsieve

To be completed...