Found with PFGW Version 3.5.2

71^8142+70 is 2-PRP! (16.8559s+0.0047s)
71^8142+70 is 3-PRP! (19.4170s+0.0073s)
71^8142+70 is 5-PRP! (21.5003s+0.0064s)
71^8142+70 is 7-PRP! (22.5354s+0.0078s)
71^8142+70 is 11-PRP! (23.5016s+0.0078s)

Primality testing 71^8142+70 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 7
Running N+1 test using discriminant 19, base 1+sqrt(19)
Calling N+1 BLS with factored part 0.03% and helper 0.02% (0.12% proof)
71^8142+70 is Fermat and Lucas PRP! (150.8367s+0.0095s)

To be completed...