M000000089

$$\pi=18620\arctan\left(\frac{2}{13489}\right)+6464\arctan\left(\frac{2}{47239}\right)+10760\arctan\left(\frac{1}{96348}\right)+2324\arctan\left(\frac{2}{362619}\right)-14196\arctan\left(\frac{1}{734557}\right)+1064\arctan\left(\frac{1}{6826318}\right)+13132\arctan\left(\frac{1}{7626068}\right)+8260\arctan\left(\frac{1}{21072618}\right)-7528\arctan\left(\frac{1}{26157373}\right)$$