M000000027

$$\pi=41204\arctan\left(\frac{1}{12943}\right)-5760\arctan\left(\frac{1}{31182}\right)+1592\arctan\left(\frac{2}{362619}\right)+19352\arctan\left(\frac{1}{188703}\right)+48284\arctan\left(\frac{2}{2885139}\right)-732\arctan\left(\frac{1}{1610057}\right)-8388\arctan\left(\frac{1}{6826318}\right)-31304\arctan\left(\frac{1}{103224943}\right)+6796\arctan\left(\frac{1}{20318316993}\right)$$