531441/262144
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hexatone
(Shannon, [math]\sqrt{nd}[/math])
The Pythagorean augmented seventh, otherwise known as the hexatone, 531441/262144, is the interval found by stacking six (Pythagorean whole) tones (9/8). The Medieval music theorist Jacobus of Liège described it along with the ditone, tritone, tetratone, and pentatone, and noted that the hexatone was a rough discord, not equivalent to a pure octave;[1] it is wider than the octave by one Pythagorean comma.