Found with PFGW Version 3.6.0

3457^6380-6380^3457 is 2-PRP! (22.4665s+0.0037s)
3457^6380-6380^3457 is 3-PRP! (22.3502s+0.0049s)
3457^6380-6380^3457 is 5-PRP! (22.4348s+0.0059s)
3457^6380-6380^3457 is 7-PRP! (22.8602s+0.0045s)
3457^6380-6380^3457 is 11-PRP! (23.1799s+0.0046s)

Primality testing 3457^6380-6380^3457 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Running N+1 test using discriminant 7, base 1+sqrt(7)
Calling N-1 BLS with factored part 0.03% and helper 0.02% (0.11% proof)
3457^6380-6380^3457 is Fermat and Lucas PRP! (106.9771s+0.0028s)

To be completed...