19afdo
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| Prime factorization | 19 (prime) |
| Fifth | 29/19 (732.064c) |
| Dual sharp fifth | 29/19 (732.064c) |
| Dual flat fifth | 28/19 (671.312c) |
19afdo (arithmetic frequency division of the octave), or 19odo (otonal division of the octave), divides the octave into 19 parts of 1/19 each. As a scale it may be known as mode 19 of the harmonic series or the Over-19 scale.