M000000526

$$\pi=68\arctan\left(\frac{1}{3}\right)-68\arctan\left(\frac{1}{4}\right)-68\arctan\left(\frac{1}{30}\right)+32\arctan\left(\frac{1}{182}\right)+20\arctan\left(\frac{2}{3611}\right)+20\arctan\left(\frac{1}{623098}\right)$$