21/19
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| Ratio | 21/19 |
| Factorization | 3 × 7 × 19-1 |
| Monzo | [0 1 0 1 0 0 0 -1⟩ |
| Size in cents | 173.26789¢ |
| Names | hendrix major second, undevicesimal submajor second, undevicesimal supraneutral second |
| Color name | 19uz2, nuzo 2nd |
| FJS name | [math]\text{M2}^{7}_{19}[/math] |
| Special properties | reduced |
| Tenney height (log2 nd) | 8.64024 |
| Weil height (log2 max(n, d)) | 8.78463 |
| Wilson height (sopfr(nd)) | 29 |
| Harmonic entropy (Shannon, [math]\sqrt{nd}[/math]) |
~4.21455 bits |
[sound info] | |
| open this interval in xen-calc | |
In 19-limit just intonation, 21/19 is the hendrix major second, also known as the undevicesimal submajor second or undevicesimal supraneutral second. It falls short of the Pythagorean major second (9/8) by a hendrix comma (57/56).