M000000070

$$\pi=732\arctan\left(\frac{1}{239}\right)-48\arctan\left(\frac{1}{682}\right)+352\arctan\left(\frac{1}{2478}\right)+96\arctan\left(\frac{1}{12943}\right)-176\arctan\left(\frac{1}{740943}\right)+352\arctan\left(\frac{1}{620658852}\right)$$