Primality testing Phi(2851,2879) [N-1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 19
Running N-1 test using base 23
Calling Brillhart-Lehmer-Selfridge with factored part 28.15%
Phi(2851,2879) is PRP! (804.0006s+0.0049s)