This cannot be answered properly because at least two numbers are required.
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There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of two or more fractions.
LCD(3, 26) = 78
The least common denominator is 60.
a least common (LCD) denominator is a least common multiple (LCM); only it's a fraction and it's LCM is in the denominator's place.
The least common denominator for 9 and 10 is 90.