M000000017

$$\pi=508\arctan\left(\frac{1}{239}\right)+1024\arctan\left(\frac{1}{1068}\right)+752\arctan\left(\frac{1}{11379}\right)-400\arctan\left(\frac{2}{81487}\right)+176\arctan\left(\frac{1}{173932}\right)-752\arctan\left(\frac{1}{3819719818}\right)$$