Found with PFGW Version 3.7.5

283^8870-8870^283 is 2-PRP! (8.7260s+0.0009s)
283^8870-8870^283 is 3-PRP! (8.7268s+0.0010s)
283^8870-8870^283 is 5-PRP! (8.7104s+0.0010s)
283^8870-8870^283 is 7-PRP! (8.7435s+0.0009s)
283^8870-8870^283 is 11-PRP! (8.7182s+0.0010s)

Primality testing 283^8870-8870^283 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Running N-1 test using base 13
Running N+1 test using discriminant 31, base 1+sqrt(31)
Calling N-1 BLS with factored part 0.04% and helper 0.04% (0.18% proof)
283^8870-8870^283 is Fermat and Lucas PRP! (52.0387s+0.0018s)

To be completed...