4/1

4/1 is the 4th harmonic, or the tetrave; two octaves: (2/1)².

Interval information

Ratio	4/1
Factorization	22
Monzo	[2⟩
Size in cents	2400¢
Names	4th harmonic, tetrave, double octave
Color name	wa 15th
FJS name	[math]\displaystyle{ \text{P15} }[/math]
Special properties	harmonic, highly composite harmonic
Tenney norm (log2 nd)	2
Weil norm (log2 max(n, d))	4
Wilson norm (sopfr(nd))	4
[sound info]
Open this interval in xen-calc

See also

• Ed4 – Equal divisions of the 4th harmonic