400/399

Interval information

Ratio	400/399
Factorization	24 × 3-1 × 52 × 7-1 × 19-1
Monzo	[4 -1 2 -1 0 0 0 -1⟩
Size in cents	4.333504¢
Name	devichroma
Color name	19uryy-2, nuruyoyo negative 2nd, Nuruyoyo comma
FJS name	[math]\displaystyle{ \text{d}{-2}^{5,5}_{7,19} }[/math]
Special properties	square superparticular, reduced
Tenney height (log2 nd)	17.2841
Weil height (log2 max(n, d))	17.2877
Wilson height (sopfr(nd))	47
Comma size	small
S-expression	S20
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400/399, the devichroma is a 19-limit (also 2.3.5.7.19 subgroup) superparticular comma of about 4.33 cents. It is the difference between undevicesimal chroma, 20/19 and large septimal chroma, 21/20. By tempering it out is defined the devichromic temperament, which enables the devichromic chords.

Etymology

The name devichroma was named by Xenllium in 2023. It is a contraction of undevicesimal chroma into a single word.

See also

• Small comma
• List of superparticular intervals