31afdo
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| Prime factorization | 31 (prime) |
| Fifth | 47/31 (720.471c) |
| Dual sharp fifth | 47/31 (720.471c) |
| Dual flat fifth | 46/31 (683.238c) |
31afdo (arithmetic frequency division of the octave), or 31odo (otonal division of the octave), divides the octave into 31 parts of 1/31 each. As a scale it may be known as mode 31 of the harmonic series or the Over-31 scale.