M000000088

$$\pi=3232\arctan\left(\frac{1}{1407}\right)+1064\arctan\left(\frac{2}{3351}\right)+1436\arctan\left(\frac{2}{13489}\right)+732\arctan\left(\frac{2}{234881}\right)-1308\arctan\left(\frac{2}{313489}\right)-332\arctan\left(\frac{1}{390112}\right)-1308\arctan\left(\frac{1}{2733307}\right)$$