Primality testing 2072^20339-20339^2072 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Running N+1 test using discriminant 11, base 2+sqrt(11)
Calling N-1 BLS with factored part 0.01% and helper 0.00% (0.05% proof)
2072^20339-20339^2072 is Fermat and Lucas PRP! (195.0995s+0.0024s)

Sieved with xyyxsieve

To be completed...