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<- 22afdo 23afdo 24afdo ->
Prime factorization 23 (prime)
Fifth 35/23 (726.865c)
Dual sharp fifth 35/23 (726.865c)
Dual flat fifth 34/23 (676.681c)

23afdo (arithmetic frequency division of the octave), or 23odo (otonal division of the octave), divides the octave into 23 parts of 1/23 each. As a scale it may be known as mode 23 of the harmonic series or the Over-23 scale.