PRP in base 11 and 13 For (163^n+1)/164, I found hitherto: (163^3+1)/164 (163^11+1)/164 (163^31+1)/164 (163^661+1)/164 (163^1999+1)/164 (163^4079+1)/164 (163^6917+1)/164 (163^27427+1)/164
To be completed...