Found with PFGW Version 3.6.0

76^19389+75 is 2-PRP! (22.2803s+0.0036s)
76^19389+75 is 3-PRP! (22.2138s+0.0026s)
76^19389+75 is 5-PRP! (22.2751s+0.0021s)
76^19389+75 is 7-PRP! (22.2372s+0.0025s)
76^19389+75 is 11-PRP! (22.1519s+0.0023s)

Primality testing 76^19389+75 [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 0.03% and helper 0.01% (0.09% proof)
76^19389+75 is Fermat and Lucas PRP! (153.0999s+0.0053s)

To be completed...