M000000056

$$\pi=152\arctan\left(\frac{1}{47}\right)-56\arctan\left(\frac{1}{610}\right)-48\arctan\left(\frac{1}{247057}\right)+24\arctan\left(\frac{1}{740943}\right)+56\arctan\left(\frac{1}{15628852}\right)-28\arctan\left(\frac{1}{54608393}\right)$$