Found with PFGW Version 3.7.5

848^7845-7845^848 is 2-PRP! (26.4520s+0.0036s)
848^7845-7845^848 is 3-PRP! (25.0931s+0.0037s)
848^7845-7845^848 is 5-PRP! (25.5585s+0.0038s)
848^7845-7845^848 is 7-PRP! (19.6511s+0.0016s)
848^7845-7845^848 is 11-PRP! (21.1117s+0.0036s)

Primality testing 848^7845-7845^848 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 5
Running N+1 test using discriminant 11, base 3+sqrt(11)
Calling N+1 BLS with factored part 0.03% and helper 0.01% (0.09% proof)
848^7845-7845^848 is Fermat and Lucas PRP! (122.6219s+0.0044s)

To be completed...