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491EDO is the equal division of the octave into 491 parts of 2.44399 cents each. In the 5-limit it tempers out the parakleima, |8 14 -13>; in the 7-limit 65625/65536 and 420175/419904; in the 11-limit 441/440 and 8019/8000; in the 13-limit 729/728 and 4225/4224, and provides the optimal patent val for 11-limit history temperament, tempering out 441/440 and 4000/3993.

491EDO is the 94th prime EDO.