140/81

Interval information

Ratio	140/81
Factorization	22 × 3-4 × 5 × 7
Monzo	[2 -4 1 1⟩
Size in cents	947.3196¢
Name	septimal inframinor seventh
Color name	zy7, zoyo 7th
FJS name	[math]\displaystyle{ \text{m7}^{5,7} }[/math]
Special properties	reduced
Tenney norm (log2 nd)	13.4691
Weil norm (log2 max(n, d))	14.2586
Wilson norm (sopfr(nd))	28
[sound info]
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140/81, the septimal inframinor seventh is a 7-limit interseptimal ratio of about 947 cents. It is flat of a minor seventh 16/9 by a septimal quartertone 36/35, flat of a subminor seventh 7/4 by a syntonic comma 81/80, and sharp of a supermajor sixth 12/7 by a sensamagic comma 245/243.

Notice it is also sharp of the just major sixth 5/3 by a subminor second 28/27. For this fact it is useful in the sensamagic dominant chord where it functions as a dissonance yet to be resolved down to the major sixth. The canou temperament targets this progression and uses it as one of the generators.

Approximation

It is perfectly approximated by 19edo (15\19), with an error of 0.05 cents, and hence equally well done by the enneadecal temperament.

See also

• 81/70 – its octave complement
• Gallery of just intervals