M000000731

$$\pi=16\arctan\left(\frac{1}{4}\right)-16\arctan\left(\frac{1}{32}\right)-16\arctan\left(\frac{1}{60}\right)-4\arctan\left(\frac{1}{238}\right)+16\arctan\left(\frac{1}{3107}\right)+4\arctan\left(\frac{1}{56883}\right)$$