M000384

$$\pi=\frac{224}{3}\arctan\left(\frac{1}{23}\right)\frac{-4}{3}\arctan\left(\frac{1}{182}\right)\frac{-100}{3}\arctan\left(\frac{1}{500}\right)\frac{-80}{3}\arctan\left(\frac{1}{924}\right)+\frac{20}{3}\arctan\left(\frac{1}{99557}\right)+\frac{40}{3}\arctan\left(\frac{1}{298307}\right)$$