Found with PFGW Version 3.7.5

207^10400-10400^207 is 2-PRP! (9.8671s+0.0018s)
207^10400-10400^207 is 3-PRP! (9.6759s+0.0020s)
207^10400-10400^207 is 5-PRP! (9.6303s+0.0021s)
207^10400-10400^207 is 7-PRP! (9.6538s+0.0020s)
207^10400-10400^207 is 11-PRP! (9.7264s+0.0027s)

Primality testing 207^10400-10400^207 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 7
Running N+1 test using discriminant 17, base 8+sqrt(17)
Calling N-1 BLS with factored part 0.10% and helper 0.02% (0.32% proof)
207^10400-10400^207 is Fermat and Lucas PRP! (52.3448s+0.0022s)

To be completed...