Listed on Makoto Kamada s site: http://hpcgi2.nifty.com/m_kamada/f/phin10.cgi?p=285#P28455
Primality testing Phi(28455,10)/56911/15410775906961/227115917005111/26398324633723561 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Generic modular reduction using generic reduction FFT length 4K on A 42891-bit number
Running N-1 test using base 7
Generic modular reduction using generic reduction FFT length 4K on A 42891-bit number
Running N+1 test using discriminant 13, base 2+sqrt(13)
Generic modular reduction using generic reduction FFT length 4K on A 42891-bit number
Calling N+1 BLS with factored part 0.07% and helper 0.05% (0.25% proof)
Phi(28455,10)/56911/15410775906961/227115917005111/26398324633723561 is Fermat and Lucas PRP! (174.4310s+0.0167s)
To be completed...