100/81

Interval information

Ratio	100/81
Factorization	22 × 3-4 × 52
Monzo	[2 -4 2⟩
Size in cents	364.8074 ¢
Names	classical grave major third, diptolemaic major third
Color name	yy3, yoyo 3rd
FJS name	[math]\displaystyle{ \text{M3}^{5,5} }[/math]
Special properties	reduced
Tenney norm (log2 nd)	12.9837
Weil norm (log2 max(n, d))	13.2877
Wilson norm (sopfr(nd))	26
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100/81, the classical grave major third or diptolemaic major third, is a syntonic comma (81/80) flat of 5/4. It can be obtained by stacking two small whole tones (10/9).

In the 13-limit, it is a marveltwin comma (325/324) sharp of 16/13, and in the 17-limit, merely a palingenetic comma (1701/1700) flat of the interval 21/17