Found with PFGW Version 3.5.2

75^9939+74 is 2-PRP! (19.2618s+0.1124s)
75^9939+74 is 3-PRP! (26.1032s+0.0062s)
75^9939+74 is 5-PRP! (26.8971s+0.0072s)
75^9939+74 is 7-PRP! (27.5360s+0.0074s)
75^9939+74 is 11-PRP! (27.6073s+0.0080s)

Primality testing 75^9939+74 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 2
Running N+1 test using discriminant 7, base 2+sqrt(7)
Calling N-1 BLS with factored part 0.04% and helper 0.03% (0.16% proof)
75^9939+74 is Fermat and Lucas PRP! (181.1356s+0.0140s)

To be completed...