Primality testing 1361^21668-21668^1361 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Running N+1 test using discriminant 11, base 1+sqrt(11)
Calling N+1 BLS with factored part 0.02% and helper 0.00% (0.06% proof)
1361^21668-21668^1361 is Fermat and Lucas PRP! (215.9892s+0.0020s)

Sieved with xyyxsieve

To be completed...