M000000019

$$\pi=152\arctan\left(\frac{1}{47}\right)-56\arctan\left(\frac{1}{610}\right)-24\arctan\left(\frac{2}{296489}\right)+56\arctan\left(\frac{1}{15628852}\right)-28\arctan\left(\frac{1}{54608393}\right)-24\arctan\left(\frac{1}{18677233307}\right)$$