14:18:21

Chord information

Harmonics	14:18:21
Subharmonics	1/(9:7:6)
Intervals from root	1/1–9/7–3/2
Cents from root	0¢–435¢–702¢
Step intervals	9/7, 7/6
Step cents	435¢, 267¢
Color name	ru or r
Prime limit	7
Genus	32⋅7 (63)
Intervallic odd limit	9
Otonal odd limit	21
Utonal odd limit	9
Consistent edos (d ≥ 2)	5edo*, 14edo*, 17edo*, 19edo*, …
* 2 ≤ d < 4; ** 4 ≤ d < 8; *** 8 ≤ d < 16; …

14:18:21, the supermajor triad or septimal major triad, is a triad in the 7-limit sometimes used in place of a major triad. It is the inversion of 6:7:9, the septimal minor triad or subminor triad. The supermajor triad, unlike the 4:5:6 major triad, is utonal. Due to the more complex 9/7 interval above the root, it may sound less consonant than 6:7:9, similarly to how the 10:12:15 minor triad is generally considered less consonant than 4:5:6.

Related chords

• 6:7:9 – its melodic inversion
• 70:90:105:126 or 1/(9:7:6:5), the subharmonic seventh chord – adds 9/5
• 28:36:42:49, a type of dominant seventh chord – adds 7/4
• 14:18:21:27 – adds 27/14