391/390
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| 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 | 4.4333803¢ |
| Name | minor naiadvicema |
| Color name | 23o17o3ug2, twethosothugu 2nd, Twethosothugu comma |
| FJS name | [math]\text{P1}^{17,23}_{5,13}[/math] |
| Special properties | superparticular, reduced |
| Tenney height (log2 nd) | 17.2184 |
| Weil height (log2 max(n, d)) | 17.222 |
| Wilson height (sopfr(nd)) | 63 |
| Harmonic entropy (Shannon, [math]\sqrt{nd}[/math]) |
~1.3806 bits |
| Comma size | small |
| open this interval in xen-calc | |
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.