M000000885

$$\pi=-68\arctan\left(\frac{1}{2}\right)+68\arctan\left(\frac{1}{3}\right)+68\arctan\left(\frac{1}{5}\right)-68\arctan\left(\frac{1}{83}\right)+32\arctan\left(\frac{1}{182}\right)+20\arctan\left(\frac{2}{3611}\right)+20\arctan\left(\frac{1}{623098}\right)$$