Found with PFGW Version 3.7.5

6450^9997-9997^6450 is 2-PRP! (26.4143s+0.0022s)
6450^9997-9997^6450 is 3-PRP! (26.4937s+0.0017s)
6450^9997-9997^6450 is 5-PRP! (26.2575s+0.0018s)
6450^9997-9997^6450 is 7-PRP! (26.2571s+0.0016s)
6450^9997-9997^6450 is 11-PRP! (26.4297s+0.0016s)

Primality testing 6450^9997-9997^6450 [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 0.02% and helper 0.01% (0.08% proof)
6450^9997-9997^6450 is Fermat and Lucas PRP! (151.4589s+0.0031s)

To be completed...