PFGW:
Primality testing 5*10^140744-7 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 5
Running N+1 test using discriminant 17, base 6+sqrt(17)
Calling N+1 BLS with factored part 0.01% and helper 0.00% (0.03% proof)
5*10^140744-7 is Fermat and Lucas PRP! (1785.9884s+0.0069s)

To be completed...