Found with PFGW Version 3.5.2

873^3530-3530^873 is 2-PRP! (10.8426s+0.0049s)
873^3530-3530^873 is 3-PRP! (17.3136s+0.0010s)
873^3530-3530^873 is 5-PRP! (24.1428s+0.0012s)
873^3530-3530^873 is 7-PRP! (21.3567s+0.0010s)
873^3530-3530^873 is 11-PRP! (19.2703s+0.0010s)

Primality testing 873^3530-3530^873 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 7
Running N+1 test using discriminant 19, base 9+sqrt(19)
Calling N+1 BLS with factored part 0.04% and helper 0.02% (0.14% proof)
873^3530-3530^873 is Fermat and Lucas PRP! (104.5643s+0.0161s)

To be completed...