Primality testing 1710^20989-20989^1710 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 7
Running N+1 test using discriminant 13, base 1+sqrt(13)
Calling N+1 BLS with factored part 0.03% and helper 0.01% (0.10% proof)
1710^20989-20989^1710 is Fermat and Lucas PRP! (215.2293s+0.0025s)

Sieved with xyyxsieve

To be completed...