Found with PFGW Version 3.8.0

6470^13503-13503^6470 is 2-PRP! (48.5843s+0.0099s)
6470^13503-13503^6470 is 3-PRP! (51.9660s+0.0106s)
6470^13503-13503^6470 is 5-PRP! (47.8066s+0.0108s)
6470^13503-13503^6470 is 7-PRP! (48.3264s+0.0127s)
6470^13503-13503^6470 is 11-PRP! (47.8773s+0.0104s)

Primality testing 6470^13503-13503^6470 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 7
Running N+1 test using discriminant 13, base 1+sqrt(13)
Calling N+1 BLS with factored part 0.01% and helper 0.01% (0.03% proof)
6470^13503-13503^6470 is Fermat and Lucas PRP! (278.3442s+0.0105s)

To be completed...