Overtone Series
Here is the overtone series with G as the fundamental. Notice the frequencies of the four G's. The first overtone (200 cps) is also called the second partial or harmonic. The scale degrees are given at right.
(Low G actually 99 cps)
The seventh partial is red because it is noticeably flat to F. Of course all the partials are in tune with the root. The limitations of equal temperament cause all but the octaves to be slightly out of tune with tempered notes.
All notes are roots to their own overtone series. When you take the quiz on the Pitch Page you will be asked to construct the overtone series of another note. The pattern is the same. I remember this pattern in terms of scale degrees.