M000000123

$$\pi=73250\arctan\left(\frac{1}{39356}\right)+51398\arctan\left(\frac{1}{51412}\right)-3398\arctan\left(\frac{1}{96348}\right)+42796\arctan\left(\frac{2}{362619}\right)+55822\arctan\left(\frac{1}{734557}\right)-28482\arctan\left(\frac{1}{6826318}\right)+61298\arctan\left(\frac{1}{7626068}\right)-2666\arctan\left(\frac{1}{21072618}\right)+3398\arctan\left(\frac{1}{26157373}\right)+40472\arctan\left(\frac{1}{2539791558}\right)$$