Harmonics 27–54
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The harmonic segment 27::54 (also harmonics 27–54) consists of harmonics 27 through 54 (27:28:…:54) and spans one octave above the root. Used as a scale, it is also called mode 27 of the harmonic series.
| Prime factorization | 33 |
| Dual sharp fifth | 41/27 (723.197c) |
| Dual flat fifth | 40/27 (680.449c) |