Harmonics 27–54
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The harmonics 27–54 (also harmonic series segment 27::54 or harmonic series mode 27) are a scale that consists of harmonics 27 through 54 (27:28:…:54) and repeats at the octave. Used as a tuning system, it is also called 27afdo.
| Prime factorization | 33 |
| Dual sharp fifth | 41/27 (723.197c) |
| Dual flat fifth | 40/27 (680.449c) |