28/9

28/9, the septimal (sub)minor thirteenth, is an interval which lies within the 9-odd-limit. It is a septimal subminor sixth plus an octave, and is the ratio between the 9th and 28th harmonics.

Interval information

Ratio	28/9
Factorization	22 × 3-2 × 7
Monzo	[2 -2 0 1⟩
Size in cents	1964.916¢
Name	septimal (sub)minor thirteenth
Color name	z13, zo 13th
FJS name	[math]\displaystyle{ \text{m13}^{7} }[/math]
Tenney norm (log2 nd)	7.97728
Weil norm (log2 max(n, d))	9.61471
Wilson norm (sopfr(nd))	17
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the ratio between the 28th and 9th harmonics.