M000000663

$$\pi=152\arctan\left(\frac{1}{2}\right)-152\arctan\left(\frac{1}{4}\right)-152\arctan\left(\frac{1}{5}\right)+28\arctan\left(\frac{1}{239}\right)-56\arctan\left(\frac{1}{268}\right)-48\arctan\left(\frac{1}{247057}\right)+24\arctan\left(\frac{1}{740943}\right)$$