That's what it does, but the counting starts from zero. So if we select 7 as a prime we get 7n. For n=0,1,2 we get 0,7,14, of which only 14 is the one we want t

That's what it does, but the counting starts from zero. So if we select 7 as a prime we get 7n. For n=0,1,2 we get 0,7,14, of which only 14 is the one we want to remove.