243/128

243/128 is the Pythagorean major seventh. It is equal to five 3/2s, octave-reduced.

Interval information

Ratio	243/128
Factorization	2-7 × 35
Monzo	[-7 5⟩
Size in cents	1109.775¢
Name	Pythagorean major seventh
Color name	Lw7, lawa 7th
FJS name	[math]\displaystyle{ \text{M7} }[/math]
Special properties	reduced, reduced harmonic
Tenney norm (log2 nd)	14.9248
Weil norm (log2 max(n, d))	15.8496
Wilson norm (sopfr(nd))	29
[sound info]
Open this interval in xen-calc

See also

• 256/243 – its octave complement
• Gallery of just intervals
• Pythagorean tuning

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