Found with PFGW Version 3.8.0

2604^12955-12955^2604 is 2-PRP! (40.2818s+0.0066s)
2604^12955-12955^2604 is 3-PRP! (39.0079s+0.0049s)
2604^12955-12955^2604 is 5-PRP! (38.7522s+0.0051s)
2604^12955-12955^2604 is 7-PRP! (40.3016s+0.0059s)
2604^12955-12955^2604 is 11-PRP! (37.8320s+0.0049s)

Primality testing 2604^12955-12955^2604 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 17
Running N+1 test using discriminant 23, base 1+sqrt(23)
Calling N+1 BLS with factored part 0.03% and helper 0.01% (0.09% proof)
2604^12955-12955^2604 is Fermat and Lucas PRP! (193.1496s+0.0104s)

To be completed...