13afdo
| ← 12afdo | 13afdo | 14afdo → |
13afdo (arithmetic frequency division of the octave), or 13odo (otonal division of the octave), divides the octave into thirteen parts of 1/13 each. As a scale it may be known as mode 13 of the harmonic series or the Over-13 scale. Due to being odd, it does not contain a perfect fifth above the root.
Intervals
| # | Cents | Ratio | Decimal | Interval name | Audio |
|---|---|---|---|---|---|
| 0 | 0.00 | 1/1 | 1.0000 | perfect unison | |
| 1 | 128.30 | 14/13 | 1.0833 | tridecimal supraminor second | |
| 2 | 247.7 | 15/13 | 1.1667 | subminor third | |
| 3 | 386.3 | 5/4 | 1.2500 | just major third | |
| 4 | 498.0 | 4/3 | 1.3333 | just perfect fourth | |
| 5 | 603.0 | 17/12 | 1.41667 | larger septendecimal tritone | |
| 6 | 702.0 | 3/2 | 1.50000 | just perfect fifth | |
| 7 | 792.6 | 19/12 | 1.58333 | large undevicesimal minor sixth | |
| 8 | 884.4 | 5/3 | 1.66667 | just major sixth | |
| 9 | 968.8 | 7/4 | 1.75000 | harmonic seventh | |
| 10 | 1049.3 | 11/6 | 1.83333 | undecimal neutral sixth | |
| 11 | 1126.3 | 23/12 | 1.91667 | vicesimotertial major seventh | |
| 12 | 1200.0 | 2/1 | 2.0000 | perfect octave |