(September 14, 2016 at 1:59 am)Alex K Wrote: Whatevers, cool, after a first reading, it looks watertight to me. As far as I am concerned, you could shorten your second step to
n^3-n=(n-1) * n * (n+1)
If n is odd, n-1 and n+1 are even
without introducing a. That made it harder to read and I don't see why you needed it.
Glad to hear you say so. Felt like sticking legs on a snake to me too. I guess I was trying to make it more math-y.