Harmonics 31–62
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The harmonics 31–62 (also harmonic series segment 31::62 or harmonic series mode 31) are a scale that consists of harmonics 31 through 62 (31:32:…:62) and repeats at the octave. Used as a tuning system, it is also called 31afdo.
| Prime factorization | 31 (prime) |
| Dual sharp fifth | 47/31 (720.471c) |
| Dual flat fifth | 46/31 (683.239c) |