1156/1155
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| Ratio | 1156/1155 |
| Factorization | 22 × 3-1 × 5-1 × 7-1 × 11-1 × 172 |
| Monzo | [2 -1 -1 -1 -1 0 2⟩ |
| Size in cents | 1.4982554¢ |
| Name | septendecimal quartertones comma |
| Color name | 17oo1urg2, sosolurugu 2nd, Sosolurugu comma |
| FJS name | [math]\text{d2}^{17,17}_{5,7,11}[/math] |
| Special properties | square superparticular, reduced |
| Tenney height (log2 n⋅d) | 20.3486 |
| Weil height (max(n, d)) | 1156 |
| Benedetti height (n⋅d) | 1335180 |
| Harmonic entropy (Shannon, [math]\sqrt{n\cdot d}[/math]) |
~2.4085 bits |
| Comma size | unnoticeable |
| S-expression | S34 |
| open this interval in xen-calc | |
1156/1155 is a 17-limit no-13 superparticular comma measuring about 1.41 cents. It may be properly described as the septendecimal quartertones comma, since it is the difference between 34/33 and 35/34, the two 17-limit quartertones.
In terms of commas, it is the difference between the following pairs:
- 289/288 and 385/384
- 442/441 and 715/714
- 561/560 and 1089/1088
- 595/594 and 1225/1224
- 936/935 and 4914/4913
It factors into the following pairs:
- 2080/2079 and 2601/2600
- 1275/1274 and 12376/12375
Temperaments
Tempering out this comma results in 35/33 being split into two equal parts, each representing 34/33~35/34, and enables the related essentially tempered chords. If 9801/9800 is also added to the comma list, the quartertone above becomes literally a quarter of 9/8 and is located right between 33/32, the undecimal quartertone, and 36/35, the septimal quartertone.