M000000049

$$\pi=\frac{62324}{3}\arctan\left(\frac{1}{6807}\right)+\frac{19352}{3}\arctan\left(\frac{2}{200779}\right)+2324\arctan\left(\frac{2}{362619}\right)+\frac{3232}{3}\arctan\left(\frac{1}{623098}\right)+4424\arctan\left(\frac{1}{734557}\right)+7528\arctan\left(\frac{1}{2634273}\right)+\frac{6424}{3}\arctan\left(\frac{1}{6826318}\right)+9900\arctan\left(\frac{1}{7626068}\right)+\frac{21548}{3}\arctan\left(\frac{1}{21072618}\right)$$