Sieved to 10^10, 3-PRP in PFGW

Primality testing 73^197880+197880 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 7
Running N-1 test using base 11
Running N-1 test using base 13
Running N-1 test using base 19
Running N+1 test using discriminant 37, base 2+sqrt(37)
Calling N-1 BLS with factored part 0.00% and helper 0.00% (0.02% proof)
73^197880+197880 is Fermat and Lucas PRP!

To be completed...