# The sum of the squares of the first n natural numbers

Submitted by Isoscel on Tue, 11/27/2007 - 21:56.

What is the sum of the squares of the first n natural numbers?

The answer is:

Here is a calculator that calculates this function for you:

n:

:

Proof:

We write the above identity for k from 1 to n:

...

We add this n identities and we get: