The smallest one is 117. Add 117 to it for the next one, and add 117 again to get to the next next one, and so on.
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117
The least common multiples of 5, 11, and 13 is 715.
Each common multiple of 9 and 10 occurs exactly once (in the list of common multiples), so there is no common multiple that occurs the most. All common multiples of 9 and 10 are the multiples of their least common multiple which is 90.
Multiples of 9 include 9, 18, 27 and so on. For them to be common, they need to be compared to another set of multiples.Itself and any other multiples of 9
Not all of them are. Consider 27. 6 and 9 share a lot of common multiples because they share a common factor.