X n 1 n 1 n 2 2. Since the numbers are consecutive the other number will be a 1. We find its consecutive integers as 4 2 and 4 4 or 6 and 8.
Use the mathematical formula sumn n n1 2 - Check - This will work only if you want to add numbers starting from 1 and up to n.
X x2 x4 x6 x8 etc. A formula for the triangular numbers. Sum of the numbers 55 a a 1. X n 1 n n1 2 n 1 x n 1 n n 1 2n 2 2.