14:18:21
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| Harmonics | 14:18:21 |
| Subharmonics | 1/(9:7:6) |
| Intervals from root | 1/1 – 9/7 – 3/2 |
| Cents from root | 0¢ 435¢ 702¢ |
| Step intervals | 9/7, 7/6 |
| Step cents | 435¢, 267¢ |
| Color name | ru or r |
| Prime limit | 7 |
| Genus | 32 ⋅ 7 (63) |
| Intervallic odd limit | 9 |
| Otonal odd limit | 21 |
| Utonal odd limit | 9 |
14:18:21, a supermajor triad or septimal major triad, is a triad in the 7-limit sometimes used in place of a major triad.