15afdo
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| Prime factorization | 3 × 5 |
| Fifth | 23/15 (740.005c) |
| Dual sharp fifth | 23/15 (740.005c) |
| Dual flat fifth | 22/15 (663.049c) |
15afdo (arithmetic frequency division of the octave), or 15odo (otonal division of the octave), divides the octave into 15 parts of 1/15 each. As a scale it may be known as mode 15 of the harmonic series or the Over-15 scale.
Intervals
| # | Cents | Ratio | Decimal | Interval name | Audio |
|---|---|---|---|---|---|
| 0 | 0.00 | 1/1 | 1.0000 | perfect unison | |
| 1 | 111.73 | 16/15 | 1.0667 | just diatonic semitone | |
| 2 | 216.69 | 17/15 | 1.1333 | septendecimal whole tone | |
| 3 | 315.64 | 6/5 | 1.2000 | just minor third | |
| 4 | 409.24 | 19/15 | 1.2667 | large undevicesimal major third | |
| 5 | 498.04 | 4/3 | 1.3333 | just perfect fourth | |
| 6 | 582.51 | 7/5 | 1.4000 | narrow tritone | |
| 7 | 663.05 | 22/15 | 1.4667 | undecimal diminished fifth | |
| 8 | 740.01 | 23/15 | 1.5333 | vicesimotertial ultraminor sixth | |
| 9 | 813.68 | 8/5 | 1.6000 | just minor sixth | |
| 10 | 884.36 | 5/3 | 1.6667 | just major sixth | |
| 11 | 952.26 | 26/15 | 1.7333 | tridecimal semitwelfth | |
| 12 | 1017.60 | 9/5 | 1.8000 | just minor seventh | |
| 13 | 1080.55 | 28/15 | 1.8667 | septimal grave major seventh | |
| 14 | 1141.31 | 29/15 | 1.9333 | ||
| 15 | 1200.00 | 2/1 | 2.0000 | perfect octave |