# 273/272

 Ratio 273/272 Factorization 2-4 × 3 × 7 × 13 × 17-1 Monzo [-4 1 0 1 0 1 -1⟩ Size in cents 6.3531596¢ Names tannisma,prototannisma Color name 17u3oz1, suthozo 1sn,Suthozo comma FJS name $\text{P1}^{7,13}_{17}$ Special properties superparticular,reduced Tenney height (log2 nd) 16.1802 Weil height (log2 max(n, d)) 16.1855 Wilson height (sopfr (nd)) 48 Harmonic entropy(Shannon, $\sqrt{n\cdot d}$) ~2.56887 bits Comma size small open this interval in xen-calc

273/272, the tannisma, or the prototannisma, is a small 17-limit (also 2.3.7.13.17 subgroup) comma with a value of roughly 6.35 cents. It forms the difference between 21/17 and 16/13, and the difference between 39/32 and 17/14, as well as the difference between 17/13 and 21/16.

## Commatic relations

This comma is the difference between the following superparticular pairs:

It factors into the following superparticular pairs:

## Temperaments

Tempering out this comma in the 17-limit leads to the rank-6 prototannismic temperament, or in the 2.3.7.13.17 subgroup, the rank-4 prototannic temperament, both characterized by the equivalences introduced above, and lead to a type of essentially tempered chords called prototannismic chords. The prototannic temperament has a notable weak extension to the full 17-limit called tannic. However, that is not all, as according to Scott Dakota, tannic is actually of similar overall utility to marvel temperament[1].

### Prototannismic

Subgroup: 2.3.5.7.11.13.17

Comma list: 273/272

 [⟨ 1 0 0 0 0 0 -4 ], ⟨ 0 1 0 0 0 0 1 ], ⟨ 0 0 1 0 0 0 0 ], ⟨ 0 0 0 1 0 0 1 ], ⟨ 0 0 0 0 1 0 0 ], ⟨ 0 0 0 0 0 1 1 ]]
mapping generators: ~2, ~3, ~5, ~7, ~11, ~13

Optimal tuning (CTE): ~2 = 1\1, ~3/2 = 701.5638, ~5/4, ~7/4 = 967.5985, ~11/8, ~13/8 = 838.3951

### Prototannic

Subgroup: 2.3.7.13.17

Comma list: 273/272

Mapping[1 0 0 0 -4], 0 1 0 0 1], 0 0 1 0 1], 0 0 0 1 1]]

mapping generators: ~2, ~3, ~7, ~13

Optimal tuning (CTE): ~2 = 1\1, ~3/2 = 701.5638, ~7/4 = 967.5985, ~13/8 = 838.3951

## Etymology

This comma was named by Scott Dakota, who also devised tannic temperament, as the tannisma no later than 2017. The name tannisma does not adhere to the wiki comma logging standard that a comma name "X-isma" should not be associated to a temperament "X-ic" if "X-ic" is a weak extension of the temperament induced by the comma, since 17-limit tannic is a weak extension of 2.3.7.13.17[273/272] (see above). Prototannisma has thus been proposed as an alternative name.