|Size in cents
||harmonic/just minor seventh meantone
In Just Intonation, 71/40 is the frequency ratio between the 71th and the 40th harmonic.
It is the mean between the harmonic seventh and the just minor seventh: (7/4 + 9/5)/2 = 71/40.
Its factorization into primes is 2-3⋅5-1⋅71; its FJS name is m7715.