13afdo

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13afdo

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Prime factorization	13 (prime)
Dual sharp fifth	20/13 (745.786c)
Dual flat fifth	19/13 (656.985c)

13afdo (arithmetic frequency division of the octave), or 13odo (otonal division of the octave), divides the octave into thirteen parts of 1/13 each. As a scale it may be known as mode 13 of the harmonic series or the Over-13 scale.