729/728
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| Ratio | 729/728 |
| Factorization | 2-3 × 36 × 7-1 × 13-1 |
| Monzo | [-3 6 0 -1 0 -1⟩ |
| Size in cents | 2.376437¢ |
| Name | squbema |
| Color name | L3ur-2, lathuru negative 2nd |
| FJS name | [math]\text{d}{-2}_{7,13}[/math] |
| Special properties | square superparticular, reduced |
| Tenney height (log2 nd) | 19.0176 |
| Weil height (log2 max(n, d)) | 19.0196 |
| Wilson height (sopfr (nd)) | 44 |
| Harmonic entropy (Shannon, [math]\sqrt{nd}[/math]) |
~1.25169 bits |
| Comma size | unnoticeable |
| S-expression | S27 |
| open this interval in xen-calc | |
The squbema, 729/728, is a 13-limit superparticular comma measuring about 2.4 ¢. It is the difference between 27/26 and 28/27. It also arises as the following superparticular-comma differences: (81/80)/(91/90), (225/224)/(325/324), (243/242)/(364/363), (351/350)/(676/675), and (540/539)/(2080/2079), not to mention some nonsuperparticular but useful relations, such as (64/63)/(6656/6561). It factors into (1575/1573)(9801/9800) as well as (2200/2197)(123201/123200).
Temperaments
Tempering out this comma in the 13-limit leads to the rank-5 squbemic temperament, and enables squbemic chords. It is tempered out by several notable edos including 41edo, 72edo and 313edo among others, as well as by the 13-limit amity temperament.