1216/1215

Interval information

Ratio	1216/1215
Subgroup monzo	2.3.5.19 [6 -5 -1 1⟩
Size in cents	1.424298¢
Names	password comma, Eratosthenes' comma
FJS name	[math]\displaystyle{ \text{d2}^{19}_{5} }[/math]
Special properties	superparticular, reduced
Tenney norm (log2 nd)	20.4947
Weil norm (log2 max(n, d))	20.4959
Wilson norm (sopfr(nd))	51
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1216/1215, the password comma or Eratosthenes' comma is a 19-limit unnoticeable comma. It is the difference between 19/15 and 81/64, 19/18 and 135/128, or 20/19 and 256/243.

It is tempered out in edos including 12, 29, 41, 53, 65, 77, 87, 94, 99, 106, 111, 118, 130, 140, 152, 159, 183, 193, 205, 217, 270, 282, 311, 323, 364, 400, 422, 581, and 692.

See also

• Unnoticeable comma
• List of superparticular intervals