9/4

Interval information

Ratio	9/4
Factorization	2-2 × 32
Monzo	[-2 2⟩
Size in cents	1403.91¢
Name	Pythagorean ninth
Color name	w9, wa 9th
FJS name	[math]\displaystyle{ \text{M9} }[/math]
Tenney height (log2 nd)	5.16993
Weil height (log2 max(n, d))	6.33985
Wilson height (sopfr(nd))	10
Harmonic entropy (Shannon, [math]\displaystyle{ \sqrt{nd} }[/math])	~4.12266 bits
[sound info]
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9/4, the Pythagorean ninth; two perfect fifths (3/2 * 3/2); the ratio between the 4th and 9th harmonics; one octave above 9/8. See also ed9/4.