The only Least Common Multiple (LCM) for 17 16 is 272.
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17 is a Prime Number, because 1 and 17 are the only Least Common Multiples.
The first 3 COMMON multiples of 17 will depend upon the OTHER NUMBER(S) with which 17 has common multiples. However, they will be regularly spaced within the multiples of 17.eg the first 3 COMMON multiples of:1 and 17 are 17, 34, 51;2 and 17 are: 34, 68, 102;5 and 17 are: 85, 170, 255;17 and 34 are: 34, 68, 102etc.
There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of two or more fractions.
There is an infinite number of common multiples for 13 and 17. A common multiple of any two numbers is any number into which each of two or more number can be divided with zero remainder.
I think you mean some common multiples. Since 17 is prime, there are no common factors of 17 and 21. Now the first common multiple will be 21x17. You can use more 21s or more 17s to find additional multiples. Here is one 17x21x21 Here is another 17x17x21