M000000170

$$\pi=62324\arctan\left(\frac{2}{47239}\right)+38690\arctan\left(\frac{1}{96348}\right)+11634\arctan\left(\frac{2}{362619}\right)+9310\arctan\left(\frac{1}{187718}\right)-9310\arctan\left(\frac{1}{410038}\right)+4424\arctan\left(\frac{1}{734557}\right)-8246\arctan\left(\frac{1}{6826318}\right)+41062\arctan\left(\frac{1}{7626068}\right)+8260\arctan\left(\frac{1}{21072618}\right)-7528\arctan\left(\frac{1}{26157373}\right)$$