PFGW Version 20020515.Win_Dev (Beta software, 'caveat utilitor')
Primality testing 31^26243-30 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 7
Running N-1 test using base 11
Running N-1 test using base 17
Running N+1 test using discriminant 23, base 1+sqrt(23)
Calling N-1 BLS with factored part 0.03% and helper 0.02% (0.10% proof)
31^26243-30 is Fermat and Lucas PRP! (5025.734000 seconds)

To be completed...