7
That's an infinite list.
They are the first three multiples of LCM(5, 9), that is, the first three multiples of 45.
The first 4 multiples of 10 are: 10, 20, 30, and 40.
Three of them.
The first five nonzero multiples of 6 are 6, 12, 18, 24 and 30.
1 and 13
7
Every nonzero number has multiples. Every set of nonzero numbers has an LCM.
The first 3 multiples of 13 are: 13, 26, and 39.
Multiply a given number by successive counting numbers.
They are the positive and negative even numbers.
That's an infinite list.
They are the first three multiples of LCM(5, 9), that is, the first three multiples of 45.
All nonzero numbers have an infinite amount of multiples.
The first 4 multiples of 10 are: 10, 20, 30, and 40.
11 22 33 44