Hi guys
Sorry I joined your talk pretty late. This is a very smart question you've picked up to ask, Ashkan. To tell you the truth, I had this very question long ago when I was at the university. I asked some of my professors as well as some native speakers this question but they had no convincing answers. The point is that they don't have such an idea and in other words, the answer of this question is much more common than the question itself. And also don't forget the cultural points, too. For example, it's ok here to say odd days & even days, but in English it's meaningless.
My friends & I finally came up with these three possible questions & God knows how accurate they might be:
1. In what presidential hierarchy does John F. Kennedy stand? ( very formal )
2. Where is John F. Kennedy's place in presidential hierarchy of the U.S.? ( very formal )
2. Which president of the U.S. is John F. Kennedy? ( informal )
All the best
Keep curiosity
Reza