15:18:21:25
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| Harmonics | 15:18:21:25 |
| Subharmonics | 1/(210:175:150:126) |
| Intervals from root | 1/1 – 6/5 – 7/5 – 5/3 |
| Cents from root | 0¢ 316¢ 583¢ 884¢ |
| Step intervals | 6/5, 7/6, 25/21 |
| Step cents | 316¢, 267¢, 302¢ |
| Prime limit | 7 |
| Genus | 32 ⋅ 52 ⋅ 7 (1575) |
| Intervallic odd limit | 25 |
| Otonal odd limit | 25 |
| Utonal odd limit | 175 |
15:18:21:25 is a condissonant diminished seventh chord.
In diminished temperament, the 25-odd-limit intervals within this chord are tempered together with 7-odd-limit intervals, resulting in a 7-odd-limit essentially tempered chord.