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Interval information
Ratio 100/81
Monzo [2 -4 2
Size in cents 364.80742
Name(s) grave major third
Color name yy3, yoyo 3rd
FJS name M325
open this interval in xen-calc

100/81, the grave major third, is 81/80, a syntonic comma flat of 5/4 and 325/324 sharp of 16/13, as well as being just 1701/1700 flat of the interval 21/17. It is obtained by stacking two 10/9 small whole tones.