M000000048

$$\pi=2548\arctan\left(\frac{1}{1068}\right)+1524\arctan\left(\frac{1}{2436}\right)+3712\arctan\left(\frac{1}{26307}\right)-1768\arctan\left(\frac{1}{78813}\right)+684\arctan\left(\frac{1}{119257}\right)+1368\arctan\left(\frac{1}{235252}\right)-176\arctan\left(\frac{1}{15996882}\right)$$