Originally Posted By: The Pook
OK, you're right I'm wrong, like I said I'm not good at remembering maths. So what is the addition of the numbers called then?


I guess you are talking about triangular numbers:

T(1) = 1
T(2) = 1 + 2 = 3
T(3) = 1 + 2 + 3 = 6
T(n) = 1 + 2 + 3 + ... + (n-1) + n