A base b repunit is an integer with base b expansion containing all 1's.
a) Determine which base b repunits are divisible by factors b-1
b) Determine which base b repunits are divisible by factors b+1
The Attempt at a Solution
So a repunit of base 3 would be n=2 since we get 1. I don't get how to find any beyond this point though. I tried using other n numbers but I didn't get any others that come out to all 1's.