PFGW:
Primality testing 5^81743-4^(81743+1) [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 2
Running N-1 test using base 13
Running N+1 test using discriminant 31, base 1+sqrt(31)
Calling N-1 BLS with factored part 0.03% and helper 0.00% (0.08% proof)
5^81743-4^(81743+1) is Fermat and Lucas PRP! (1124.2286s+0.0043s)
Primality testing 5^97615-4^(97615+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 0.01% and helper 0.00% (0.04% proof)
5^97615-4^(97615+1) is Fermat and Lucas PRP! (1331.2642s+0.0052s)

To be completed...