1st PRP for 2^n-448529.

Sieved to P=200G.

Primality testing 2^74148-448529 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 109
Running N+1 test using discriminant 139, base 1+sqrt(139)
Running N+1 test using discriminant 139, base 3+sqrt(139)
Running N+1 test using discriminant 139, base 4+sqrt(139)
Calling N+1 BLS with factored part 0.06% and helper 0.05% (0.22% proof)
2^74148-448529 is Fermat and Lucas PRP! (767.1431s+0.0056s)

To be completed...