81/64

Interval information
Ratio	81/64
Factorization	2-6 × 34
Monzo	[-6 4⟩
Size in cents	407.82¢
Name	Pythagorean major third
Color name	Lw3, large wa 3rd
FJS name	[math]\displaystyle{ \text{M3} }[/math]
Special properties	reduced,; reduced harmonic
Tenney norm (log2 nd)	12.3399
Weil norm (log2 max(n, d))	12.6797
Wilson norm (sopfr(nd))	24
	https://en.xen.wiki/w/File:Jid_81_64_pluck_adu_dr220.mp3; [sound info]
	Open this interval in xen-calc

The Pythagorean major third, 81/64, may be reached by stacking four perfect fifths (3/2), and reducing by two octaves.

See also