13/9

In 13-limit just intonation, 13/9 is a high tritone measuring about 636.6¢. It appears between the 9th and 13th overtones of the harmonic series. Its inversion is 18/13, a low tritone.

Interval information

Ratio	13/9
Factorization	3-2 × 13
Monzo	[0 -2 0 0 0 1⟩
Size in cents	636.6177¢
Name	high tritone tridecimal diminished fifth
Color name	3o5, tho 5th
FJS name	[math]\displaystyle{ \text{d5}^{13} }[/math]
Special properties	reduced
Tenney norm (log2 nd)	6.87036
Weil norm (log2 max(n, d))	7.40088
Wilson norm (sopfr(nd))	19
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See also

• Gallery of just intervals