Found with PFGW Version 3.4.6

18^16761-17 is 2-PRP! (10.7176s+0.0057s)
18^16761-17 is 3-PRP! (10.3911s+0.0015s)
18^16761-17 is 5-PRP! (10.5082s+0.0015s)
18^16761-17 is 7-PRP! (10.4761s+0.0015s)
18^16761-17 is 11-PRP! (10.5153s+0.0016s)

Primality testing 18^16761-17 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Running N-1 test using base 11
Running N+1 test using discriminant 19, base 1+sqrt(19)
Calling N-1 BLS with factored part 0.40% and helper 0.04% (1.25% proof)
18^16761-17 is Fermat and Lucas PRP! (104.8974s+0.0289s)

To be completed...