161/128
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reduced harmonic
In Just Intonation, 161/128 is the frequency ratio between the 161th and the 128th harmonic.
It is the mean between the just major third and the Pythagorean major third : (5/4 + 81/64)/2 = 161/128.
It can also be calculated from the syntonic comma : ((81/80 - 1)/2 + 1)⋅(5/4) = 161/128.
Its factorization into primes is 2-7⋅7⋅23 ; its FJS name is M37,23.