81/50

Interval information

Ratio	81/50
Factorization	2-1 × 34 × 5-2
Monzo	[-1 4 -2⟩
Size in cents	835.1926 ¢
Names	classical acute minor sixth, diptolemaic minor sixth
FJS name	[math]\displaystyle{ \text{m6}_{5,5} }[/math]
Special properties	reduced
Tenney norm (log2 nd)	11.9837
Weil norm (log2 max(n, d))	12.6797
Wilson norm (sopfr(nd))	24
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81/50, the classical acute minor sixth or diptolemaic minor sixth, is a syntonic comma sharp of 8/5. It can be obtained by stacking two classic minor sevenths (9/5) and subtracting an octave, or subtracting two small whole tones (10/9) from an octave.

In the 13-limit, it is a marveltwin comma (325/324) flat of 13/8, and in the 17-limit, merely a palingenetic comma (1701/1700) sharp of the interval 34/21.