M000000020

$$\pi=2324\arctan\left(\frac{1}{1023}\right)+732\arctan\left(\frac{1}{1710}\right)+2656\arctan\left(\frac{1}{5832}\right)-1416\arctan\left(\frac{1}{103697}\right)-48\arctan\left(\frac{2}{2513489}\right)+332\arctan\left(\frac{1}{6826318}\right)-1416\arctan\left(\frac{2}{18280007883}\right)$$