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 February 29th, 2016, 12:54 PM #1 Newbie   Joined: Feb 2016 From: Durham Posts: 7 Thanks: 1 A new formula for pi? I was playing about with some maths, and I managed to find an infinite sum for $\pi$: $$\sum_{N=0}^{\infty} \frac{(2N)!}{(N!)^2 (1-2N)(1+2N) 4^{N-1}}$$ The thing is, I can't find it anywhere online. It is definitely correct, so might it be new? Does anyone know of it? I'm happy to show my proof if anyone wants to see it.
 February 29th, 2016, 02:17 PM #2 Math Team     Joined: May 2013 From: The Astral plane Posts: 1,851 Thanks: 747 Math Focus: Wibbly wobbly timey-wimey stuff. Please don't double post. See here. -Dan
 February 29th, 2016, 03:00 PM #3 Newbie   Joined: Feb 2016 From: Durham Posts: 7 Thanks: 1 Sorry, my bad.

 Tags formula, infinite, pii, sum

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