81/49

81/49, the novel submajor sixth or septimal augmented fifth, is a 7-limit interval. It is the interval created by stacking two 9/7s, and is equated to 5/3 in sensamagic (245/243) temperaments, including no-twos BPS.

Interval information

Ratio	81/49
Factorization	34 × 7-2
Monzo	[0 4 0 -2⟩
Size in cents	870.1682¢
Names	Septimal augmented fifth, novel submajor sixth
FJS name	[math]\displaystyle{ \text{A5}_{7,7} }[/math]
Special properties	reduced
Tenney norm (log2 nd)	11.9546
Weil norm (log2 max(n, d))	12.6797
Wilson norm (sopfr(nd))	26
Open this interval in xen-calc

See also

• 98/81, its octave complement

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