M000000047

$$\pi=684\arctan\left(\frac{1}{239}\right)+96\arctan\left(\frac{2}{1511}\right)+752\arctan\left(\frac{1}{4443}\right)-704\arctan\left(\frac{2}{86161}\right)-176\arctan\left(\frac{1}{740943}\right)-352\arctan\left(\frac{1}{5926518}\right)$$