M000000008

$$\pi=5380\arctan\left(\frac{1}{1712}\right)-88\arctan\left(\frac{1}{103697}\right)-48\arctan\left(\frac{2}{2513489}\right)+68\arctan\left(\frac{2}{2927521}\right)-332\arctan\left(\frac{1}{4900493}\right)-664\arctan\left(\frac{1}{39202018}\right)-1328\arctan\left(\frac{1}{313612292}\right)-2656\arctan\left(\frac{1}{2508890632}\right)-88\arctan\left(\frac{2}{18280007883}\right)$$