This is the Pythagorean comma:

octave> 1.5^12/2^7

ans = 1.0136

This is a cent:

octave> 2^(1/1200)

ans = 1.0006

This is the Pythagorean comma in cents:

octave> log(1.5^12/2^7) / log(2^(1/1200))

ans = 23.460

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