Found with PFGW Version 3.6.0

85^17926+84 is 2-PRP! (20.9963s+0.0031s)
85^17926+84 is 3-PRP! (20.8970s+0.0031s)
85^17926+84 is 5-PRP! (20.8872s+0.0031s)
85^17926+84 is 7-PRP! (20.9562s+0.0031s)
85^17926+84 is 11-PRP! (20.8630s+0.0031s)

Primality testing 85^17926+84 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 2
Running N+1 test using discriminant 11, base 1+sqrt(11)
Calling N+1 BLS with factored part 0.19% and helper 0.04% (0.62% proof)
85^17926+84 is Fermat and Lucas PRP! (143.4463s+0.0036s)

To be completed...