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.
The first 10 multiples of 13 are: 13, 26, 39, 52, 65, 78, 91, 104, 117, and 130.
You need at least two numbers to find something in common between them.
There is an infinite number of common multiples for 13 and 18. A common multiple of any two numbers is any number into which each of two or more numbers can be divided evenly (zero remainder).
There is an infinite number of common multiples for 13 and 22. A common multiple of any two numbers is any number into which each of two or more numbers can be divided evenly (zero remainder).
Itself because 1 times 13 = 13
Multiples of 13 include 13, 26, 39 and so on. For them to be common, they need to be compared to another set of multiples.
On some least common multiples, like this question here, there are no common multiples until you multiply the two numbers together, 40 x 13 = 520.
117, 234, 351
65, 130, and 195 are.
117, 234, 351
They are: 52, 104, 156.