Harmonics 25–50
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| Prime factorization | 52 |
| Dual sharp fifth | 38/25 (724.886c) |
| Dual flat fifth | 37/25 (678.717c) |
The harmonics 25–50 (also harmonic series segment 25::50 or harmonic series mode 25) are a scale that consists of harmonics 25 through 50 (25:26:…:50) and repeats at the octave. Used as a tuning system, it is also called 25afdo.