24306

the formula for 3 concecutive numbers is (x-1)+x+(x+1). This cancels out to make 3x, which will always be a multiple of 3.
It does not work with 4 though, because the formula is (x-1.5)+(x-0.5)+(x+0.5)+(1.5). While this also cancels out and makes 4x, this would not work as all of the numbers have to be whole numbers, but the numbers would have to have 1 decimal place for it to work.
It also works for 5 because the formula is (x-2)+(x-1)+x+(x+1)+(x+2), which cancels out to make 5x with whole numbers being there the whole way.
As you can see from this pattern, you can write all numbers which are multiples of odd numbers, using the same amount of concecutive numbers as there are in the odd factor(s).