Found with PFGW Version 3.6.0

84^14491-83 is 2-PRP! (14.0831s+0.0037s)
84^14491-83 is 3-PRP! (13.2820s+0.0044s)
84^14491-83 is 5-PRP! (13.3472s+0.0041s)
84^14491-83 is 7-PRP! (13.3109s+0.0022s)
84^14491-83 is 11-PRP! (13.3091s+0.0020s)

Primality testing 84^14491-83 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 2
Running N-1 test using base 13
Running N+1 test using discriminant 23, base 1+sqrt(23)
Calling N-1 BLS with factored part 0.96% and helper 0.00% (2.89% proof)
84^14491-83 is Fermat and Lucas PRP! (114.3045s+0.0052s)

To be completed...