1. The problem statement, all variables and given/known data If R = Zn, show that every ideal of R has the form mR for some integer m. 2. Relevant equations -- 3. The attempt at a solution Well, by a previous problem I showed mR is the principal ideal of the ring, but I don't know if that's relevant. I was given the hint to try to use GCDs somehow, but I really have no ideas. thanks so much!