# 8269edo

← 8268edo | 8269edo | 8270edo → |

**8269 equal divisions of the octave** (abbreviated **8269edo** or **8269ed2**), also called **8269-tone equal temperament** (**8269tet**) or **8269 equal temperament** (**8269et**) when viewed under a regular temperament perspective, is the tuning system that divides the octave into 8269 equal parts of about 0.145 ¢ each. Each step represents a frequency ratio of 2^{1/8269}, or the 8269th root of 2.

8269edo is both a zeta peak and zeta integral edo, which has to do with the fact that it is a very strong 19- and 23-limit system. It has a lower 19-limit and a lower 23-limit relative error than any smaller division, a lower 19-limit TE logflat badness than any smaller division, and a lower 23-limit logflat badness than any excepting 311, 581, 1578 and 2460. While 8539 has received most of the attention in this size range, 8269 is actually a bit better in the 23-limit and nearly as good in the 19-limit. They are rather like twins, including the fact both are primes. A step of 8269edo has also been similarly proposed as an interval size measure, the **major tina**.

Some of the simpler commas it tempers out include 123201/123200 in the 13-limit; 194481/194480, 336141/336140 in the 17-limit; 23409/23408, 28900/28899, 43681/43680, 89376/89375 in the 19-limit; and 21505/21504 among others in the 23-limit.

### Prime harmonics

Harmonic | 2 | 3 | 5 | 7 | 11 | 13 | 17 | 19 | 23 | 29 | 31 | 37 | |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|

Error | Absolute (¢) | +0.0000 | -0.0080 | -0.0034 | -0.0026 | -0.0058 | +0.0093 | -0.0334 | -0.0163 | -0.0484 | +0.0515 | -0.0362 | +0.0044 |

Relative (%) | +0.0 | -5.5 | -2.3 | -1.8 | -4.0 | +6.4 | -23.0 | -11.3 | -33.4 | +35.5 | -24.9 | +3.0 | |

Steps (reduced) |
8269 (0) |
13106 (4837) |
19200 (2662) |
23214 (6676) |
28606 (3799) |
30599 (5792) |
33799 (723) |
35126 (2050) |
37405 (4329) |
40171 (7095) |
40966 (7890) |
43077 (1732) |

### Subsets and supersets

8269edo is the 1037th prime edo.