M000000730

$$\pi=8\arctan\left(\frac{1}{4}\right)+12\arctan\left(\frac{1}{7}\right)-8\arctan\left(\frac{1}{32}\right)-8\arctan\left(\frac{1}{57}\right)-8\arctan\left(\frac{1}{60}\right)+8\arctan\left(\frac{1}{3107}\right)$$