729/490

729/490, the sensamagic fifth or septimal sesquiaugmented acute fourth is a 7-limit ratio of about 687 cents, flat of a just fifth 3/2 by a sensamagic comma 245/243.

Interval information

Ratio	729/490
Factorization	2-1 × 36 × 5-1 × 7-2
Monzo	[-1 6 -1 -2⟩
Size in cents	687.7645¢
Names	sensamagic fifth, septimal sesquiaugmented acute fourth
Color name	rrg4, rurugu 4th
FJS name	[math]\displaystyle{ \text{A4}_{5,7,7} }[/math]
Special properties	reduced
Tenney norm (log2 nd)	18.4464
Weil norm (log2 max(n, d))	19.0196
Wilson norm (sopfr(nd))	39
Open this interval in xen-calc

It arises in just intonation scales often as the octave complement of 980/729.

See also

• 980/729, its octave complement
• Gallery of just intervals