21afdo
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Prime factorization
3 × 7
Dual sharp fifth
32/21 (729.219c)
Dual flat fifth
31/21 (674.254c)
| ← 20afdo | 21afdo | 22afdo → |
21afdo (arithmetic frequency division of the octave), or 21odo (otonal division of the octave), divides the octave into 21 parts of 1/21 each. As a scale it may be known as mode 21 of the harmonic series or the Over-21 scale.