Question: what is the formula to find square numbers?
Answer: The difference between any perfect square and its predecessor is given by the identity n2 − (n − 1)2 = 2n − 1. Equivalently, it is possible to count square numbers by adding together the last square, the last square's root, and the current root, that is, n2 = (n − 1)2 + (n − 1) + n.