M000000045

$$\pi=\frac{5380}{7}\arctan\left(\frac{1}{239}\right)\frac{-3056}{7}\arctan\left(\frac{1}{5827}\right)\frac{-128}{7}\arctan\left(\frac{2}{97059}\right)+\frac{848}{7}\arctan\left(\frac{1}{103697}\right)-48\arctan\left(\frac{2}{2513489}\right)+\frac{3056}{7}\arctan\left(\frac{1}{1561886607}\right)+\frac{848}{7}\arctan\left(\frac{2}{18280007883}\right)+\frac{128}{7}\arctan\left(\frac{1}{14130722757}\right)$$