PFGW:
Primality testing 5^41141-4^(41141-1) [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 2
Running N+1 test using discriminant 7, base 1+sqrt(7)
Calling N+1 BLS with factored part 0.04% and helper 0.01% (0.13% proof)
5^41141-4^(41141-1) is Fermat and Lucas PRP! (235.9355s+0.0019s)
Primality testing 5^64721-4^(64721-1) [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 2
Running N-1 test using base 7
Running N+1 test using discriminant 19, base 1+sqrt(19)
Calling N+1 BLS with factored part 0.02% and helper 0.01% (0.09% proof)
5^64721-4^(64721-1) is Fermat and Lucas PRP! (685.0543s+0.0034s)

To be completed...