127/72
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In Just Intonation, 127/72 is the frequency ratio between the 127th and the 72th harmonic.
It is the mean between the harmonic seventh and the Pythagorean minor seventh: (7/4 + 16/9)/2 = 127/72.
It can also be calculated from the septimal comma: ((64/63 - 1)/2 + 1)⋅(7/4) = 127/72.
Its factorization into primes is 2-3⋅3-2⋅127; its FJS name is m7127.