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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.

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