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347EDO is the equal division of the octave into 347 parts of 3.45821 cents each. It tempers out 3136/3125 and 420175/419904 in the 7-limit, and provides an excellent tuning for the temperament tempering out both, the 49&50 temperament, and the planar hemimean temperament tempering out 3136/3125.

347EDO is the 69th prime EDO.