Found with PFGW Version 3.7.5

108^8573-107 is 2-PRP! (3.5373s+0.0021s)
108^8573-107 is 3-PRP! (3.5610s+0.0023s)
108^8573-107 is 5-PRP! (3.8743s+0.0023s)
108^8573-107 is 7-PRP! (3.5484s+0.0017s)
108^8573-107 is 11-PRP! (3.5143s+0.0019s)

Primality testing 108^8573-107 [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 0.08% and helper 0.00% (0.24% proof)
108^8573-107 is Fermat and Lucas PRP! (27.9208s+0.0038s)

To be completed...