4/1

Interval information

Ratio

4/1

Factorization

2²

[2⟩

Size in cents

2400¢

Names

4th harmonic,
double octave,
fifteenth,
tetrave

wa 15th

[math]\displaystyle{ \text{P15} }[/math]

Special properties

2

Weil height (log₂ max(n, d))

4

4

English Wikipedia has an article on:

Fifteenth

4/1 is the 4th harmonic, double octave, fifteenth, or the tetrave. It is equal to a stack of two octaves: (2/1)².

It is the equivalence interval of the meansquared temperament.

See also