Found with PFGW Version 3.7.5

7881^9862-9862^7881 is 2-PRP! (26.5564s+0.0018s)
7881^9862-9862^7881 is 3-PRP! (26.7795s+0.0018s)
7881^9862-9862^7881 is 5-PRP! (26.4501s+0.0018s)
7881^9862-9862^7881 is 7-PRP! (26.7265s+0.0018s)
7881^9862-9862^7881 is 11-PRP! (26.4157s+0.0018s)

Primality testing 7881^9862-9862^7881 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Running N+1 test using discriminant 11, base 8+sqrt(11)
Calling N-1 BLS with factored part 0.03% and helper 0.02% (0.12% proof)
7881^9862-9862^7881 is Fermat and Lucas PRP! (162.2480s+0.0026s)

To be completed...