M000000848

$$\pi=48\arctan\left(\frac{1}{3}\right)-48\arctan\left(\frac{1}{4}\right)-48\arctan\left(\frac{1}{81}\right)-4\arctan\left(\frac{1}{239}\right)+48\arctan\left(\frac{1}{467}\right)-16\arctan\left(\frac{1}{580}\right)-16\arctan\left(\frac{1}{1710}\right)$$