# 7afdo

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Prime factorization | 7 (prime) |

Fifth | 11/7 (782.492c) |

Dual sharp fifth | 11/7 (782.492c) |

Dual flat fifth | 10/7 (617.487c) |

**7afdo** (arithmetic frequency division of the octave), or **7odo** (otonal division of the octave), divides the octave into seven parts of 1/7 each. As a scale it may be known as mode 7 of the harmonic series or the Over-7 scale. As 7 is a small odd number, this AFDO does not contain a perfect fifth or any reasonable approximation to it, and it is relatively poor for its size at creating traditional tonal music.

## Intervals

# | Cents | Ratio | Decimal | Interval name | Audio |
---|---|---|---|---|---|

0 | 0 | 1/1 | 1.0000 | perfect unison | |

1 | 231.2 | 8/7 | 1.1429 | supermajor second | |

2 | 435.1 | 9/7 | 1.2857 | supermajor third | |

3 | 617.5 | 10/7 | 1.4286 | high tritone | |

4 | 782.4 | 11/7 | 1.5714 | undecimal minor sixth | |

5 | 933.1 | 12/7 | 1.7143 | supermajor sixth | |

6 | 1071.7 | 13/7 | 1.8571 | tridecimal submajor seventh | |

7 | 1200.0 | 2/1 | 2.0000 | perfect octave |