Kuragesma

The kuragesma (ratio: 43940/43923) is a unnoticeable no-7's 13-limit comma measuring about 0.670 cents. It is the difference between a stack of three 13/11's and 33/20, or between a stack of four 13/11's and 39/20.

Interval information

Ratio	43940/43923
Factorization	22 × 3-1 × 5 × 11-4 × 133
Monzo	[2 -1 1 0 -4 3⟩
Size in cents	0.6699288¢
Name	kuragesma
Color name	3o31u4y2 ,Tritho-aquadlu-ayo 2nd
FJS name	[math]\displaystyle{ \text{m2}^{5,13,13,13}_{11,11,11,11} }[/math]
Special properties	reduced
Tenney norm (log2 nd)	30.8459
Weil norm (log2 max(n, d))	30.8465
Wilson norm (sopfr(nd))	95
Comma size	unnoticeable
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In terms of other commas, it is the difference between 2080/2079 and 10648/10647. It factors into simpler commas as (4225/4224)⋅(6656/6655).

Etymology

The name was proposed by Misohito Nakai in 2025, named after his girlfriend (蒼瀬くらげ) who was interested in Xenharmonics.