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Interval information
Ratio 21/19
Factorization 3 × 7 × 19-1
Monzo [0 1 0 1 0 0 0 -1
Size in cents 173.26789¢
Names hendrix major second,
undevicesimal submajor second,
undevicesimal supraneutral second
Color name 19uz2, nuzo 2nd
FJS name [math]\text{M2}^{7}_{19}[/math]
Special properties reduced
Tenney height (log2 nd) 8.64024
Weil height (log2 max(n, d)) 8.78463
Wilson height (sopfr (nd)) 29
Harmonic entropy
(Shannon, [math]\sqrt{n\cdot d}[/math])
~4.57186 bits

[sound info]
open this interval in xen-calc

In 19-limit just intonation, 21/19 is the hendrix major second, also known as the undevicesimal submajor second or undevicesimal supraneutral second. It falls short of the Pythagorean major second (9/8) by a hendrix comma (57/56).

See also