Found with PFGW Version 3.7.5

494^8345-8345^494 is 2-PRP! (10.1084s+0.0010s)
494^8345-8345^494 is 3-PRP! (9.9123s+0.0011s)
494^8345-8345^494 is 5-PRP! (9.7131s+0.0016s)
494^8345-8345^494 is 7-PRP! (9.6619s+0.0012s)
494^8345-8345^494 is 11-PRP! (9.9857s+0.0011s)

Primality testing 494^8345-8345^494 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Running N-1 test using base 7
Running N+1 test using discriminant 17, base 1+sqrt(17)
Calling N+1 BLS with factored part 0.04% and helper 0.01% (0.14% proof)
494^8345-8345^494 is Fermat and Lucas PRP! (58.6428s+0.0019s)

To be completed...