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.

Harmonics 27–54
Prime factorization 33
Dual sharp fifth 41/27 (723.197c)
Dual flat fifth 40/27 (680.449c)