Found with PFGW Version 3.8.0

1173^12728-12728^1173 is 2-PRP! (27.1116s+0.0019s)
1173^12728-12728^1173 is 3-PRP! (27.6172s+0.0009s)
1173^12728-12728^1173 is 5-PRP! (28.9684s+0.0009s)
1173^12728-12728^1173 is 7-PRP! (27.9483s+0.0009s)
1173^12728-12728^1173 is 11-PRP! (30.9499s+0.0008s)

Primality testing 1173^12728-12728^1173 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 5
Running N-1 test using base 11
Running N-1 test using base 13
Running N+1 test using discriminant 19, base 2+sqrt(19)
Calling N+1 BLS with factored part 0.04% and helper 0.02% (0.16% proof)
1173^12728-12728^1173 is Fermat and Lucas PRP! (210.8146s+0.0044s)

To be completed...