Primality testing 5^15957+12
[N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Running N+1 test using discriminant 19, base 3+sqrt(19)
5^15957+12 is Fermat and Lucas PRP! (90.5850s+0.0784s)

To be completed...