Harmonics 21–42
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| Prime factorization | 3 × 7 |
| Dual sharp fifth | 32/21 (729.219c) |
| Dual flat fifth | 31/21 (674.255c) |
The harmonic segment 21::42 (also harmonics 21–42) consists of harmonics 21 through 42 (21:22:…:42) and spans one octave above the root. Used as a scale, it is also called mode 21 of the harmonic series.