391/390

Interval information

Ratio	391/390
Factorization	2-1 × 3-1 × 5-1 × 13-1 × 17 × 23
Monzo	[-1 -1 -1 0 0 -1 1 0 1⟩
Size in cents	4.43338¢
Name	minor naiadvicema
Color name	23o17o3ug2, twethosothugu 2nd, Twethosothugu comma
FJS name	[math]\displaystyle{ \text{P1}^{17,23}_{5,13} }[/math]
Special properties	superparticular, reduced
Tenney norm (log2 nd)	17.2184
Weil norm (log2 max(n, d))	17.222
Wilson norm (sopfr(nd))	63
Comma size	small
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391/390, the minor naiadvicema is a 23-limit superparticular comma measuring about 4.43 cents. It forms the difference between 17/13 (septendecimal sub-fourth) and 30/23 (vicesimotertial semisixth).

Etymology

The name minor naiadvicema is contrast to the major naiadvicema, 300/299, measuring about 5.78¢, which is the difference between 13/10 and 30/23. 391/390 is smaller than 300/299 by a 23-limit unnoticeable comma, 9000/8993. The word naiadvicema was introduced by Xenllium in 2023. It is a contraction of naiadic vicesimotertial comma into a single word.

See also

• Small comma
• List of superparticular intervals