M000000201

$$\pi=152\arctan\left(\frac{1}{47}\right)-28\arctan\left(\frac{1}{307}\right)-28\arctan\left(\frac{1}{39307}\right)+8\arctan\left(\frac{1}{247057}\right)-28\arctan\left(\frac{1}{390112}\right)-4\arctan\left(\frac{1}{740943}\right)$$