Septimal semicomma

In music, the septimal semicomma, a seven-limit semicomma, is the ratio 126/125 and is equal to approximately 13.79 cents ( play ). It is also called the small septimal comma and the starling comma after its use in starling temperament.

Factored into primes it is: ${\displaystyle 2*3^{2}*5^{-3}*7}$

Or as simple just intervals: ${\displaystyle (6/5)^{3}*(7/6)*(2/1)^{-1}}$

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Wikipedia