The pentatone, 59049/32768, is the interval found by stacking five (Pythagorean whole) tones (9/8). The Medieval music theorist Jacobus of Liège described it along with the ditone, tritone, tetratone, and hexatone, and considered the pentatone to be highly discordant.[1]

Interval information
Ratio 59049/32768
Factorization 2-15 × 310
Monzo [-15 10
Size in cents 1019.55¢
Name pentatone
FJS name [math]\displaystyle{ \text{A6} }[/math]
Special properties reduced,
reduced harmonic
Tenney norm (log2 nd) 30.8496
Weil norm (log2 max(n, d)) 31.6993
Wilson norm (sopfr(nd)) 60
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  1. Pythagorean Tuning and Medieval Polyphony, Margo Schulter, 10 June 1998