26-comma

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Interval information
Ratio 2541865828329/2199023255552
Factorization 2-41 × 326
Monzo [-41 26
Size in cents 250.83002¢
Names 26-comma,
Pythagorean inverse triple-diminished second
Color name Wa-26, L4w-2
FJS name [math]\text{ddd}{-2}[/math]
Special properties reduced,
reduced harmonic
Tenney height (log2 nd) 82.209
Weil height (log2 max(n, d)) 82.4181
Wilson height (sopfr(nd)) 160
Harmonic entropy
(Shannon, [math]\sqrt{nd}[/math])
~4.22806 bits
Comma size large
open this interval in xen-calc

The 26-comma is a 3-limit semifourth that acts as a comma in certain temperaments. It is the difference between 26 perfect fifths and 15 octaves, as well as being two Pythagorean commas sharp of 9/8.

While it is exceptionally large for a comma (two of them make a near-perfect fourth, off by the small 53-comma), it is tempered out in 26edo, because of that temperament's narrow fifths.

Used as an interval in its own right, it is the Pythagorean inverse triple-diminished second. It approximates intervals like 15/13, and is the simplest Pythagorean interval of this size. As such, it could also be known as the Pythagorean semifourth.