11/10

11/10, the large neutral second, is an interval favored by Ptolemy. Three of them are less than 4/3 by the wizardharry comma, 4000/3993.

Interval information

Ratio	11/10
Factorization	2-1 × 5-1 × 11
Monzo	[-1 0 -1 0 1⟩
Size in cents	165.0042¢
Name	large neutral second
Color name	1og2, logu 2nd
FJS name	[math]\displaystyle{ \text{m2}^{11}_{5} }[/math]
Special properties	superparticular, reduced
Tenney norm (log2 nd)	6.78136
Weil norm (log2 max(n, d))	6.91886
Wilson norm (sopfr(nd))	18
[sound info]
Open this interval in xen-calc

Coincidentally, the interval between the most common tuning frequency (A440) and the second most common AC electrical frequency (50hz) is exactly 44/5, or three octaves above an 11/10.

See also Gallery of Just Intervals