1st PRP for 28^n-17109

Sieved to P=10G

Primality testing 28^7172-17109 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 2
Running N-1 test using base 3
Running N+1 test using discriminant 13, base 2+sqrt(13)
Running N+1 test using discriminant 13, base 3+sqrt(13)
Calling N-1 BLS with factored part 0.06% and helper 0.02% (0.21% proof)
28^7172-17109 is Fermat and Lucas PRP! (152.6151s+0.0032s)

To be completed...