81/55
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| Ratio | 81/55 |
| Factorization | 34 × 5-1 × 11-1 |
| Monzo | [0 4 -1 0 -1⟩ |
| Size in cents | 670.18835¢ |
| Name | undecimal acute paraminor fifth |
| Color name | 1ug5, lugu 5th |
| FJS name | [math]\text{P5}_{5,11}[/math] |
| Special properties | reduced |
| Tenney height (log2 nd) | 12.1212 |
| Weil height (log2 max(n, d)) | 12.6797 |
| Wilson height (sopfr (nd)) | 28 |
| Harmonic entropy (Shannon, [math]\sqrt{n\cdot d}[/math]) |
~4.58753 bits |
| open this interval in xen-calc | |
81/55, the undecimal acute paraminor fifth, is an 11-limit interval. It is 243/242 (7.1 ¢) sharp of 22/15, and is the interval between 10/9 and 18/11, as well as between 11/9 and 9/5. It is also 55/54 flat of the perfect fifth (3/2). Most conspicuously, it is 81/80 sharp of 16/11, which is what leads to its name.