Aluminium comma

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Interval information
Factorization 292 × 3-39 × 5-13
Monzo [92 -39 -13
Size in cents 1.676686¢
Name aluminium comma
Color name s7g138, sepsa-thegu octave
FJS name [math]\text{13d8}_{5,5,5,5,5,5,5,5,5,5,5,5,5}[/math]
Special properties reduced
Tenney height (log2 nd) 183.999
Weil height (log2 max(n, d)) 184
Wilson height (sopfr (nd)) 366
Harmonic entropy
(Shannon, [math]\sqrt{nd}[/math])
~1.22449 bits
Comma size unnoticeable
open this interval in xen-calc

Aluminium comma is a 5-limit interval which sets the difference between a stack of thirteen major limmas and the octave. It is named after the 13th chemical element. For EDOs N up to ~2000, it is tempered if and only if 13 divides N.


Notable edos tempering it out are 65edo, 494edo which is a zeta edo, and 1547edo. For higher-limit extensions, see Ragismic microtemperaments#Aluminium.