Found with PFGW Version 3.6.0

1615^4184-4184^1615 is 2-PRP! (8.8498s+0.0034s)
1615^4184-4184^1615 is 3-PRP! (9.2258s+0.0022s)
1615^4184-4184^1615 is 5-PRP! (9.1178s+0.0017s)
1615^4184-4184^1615 is 7-PRP! (9.1016s+0.0018s)
1615^4184-4184^1615 is 11-PRP! (9.4422s+0.0019s)

Primality testing 1615^4184-4184^1615 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Running N+1 test using discriminant 7, base 1+sqrt(7)
Calling N-1 BLS with factored part 0.05% and helper 0.04% (0.19% proof)
1615^4184-4184^1615 is Fermat and Lucas PRP! (43.0853s+0.0018s)

To be completed...