M000000883

$$\pi=-68\arctan\left(\frac{1}{2}\right)+68\arctan\left(\frac{1}{3}\right)+68\arctan\left(\frac{1}{5}\right)-68\arctan\left(\frac{1}{83}\right)+32\arctan\left(\frac{1}{182}\right)+40\arctan\left(\frac{1}{5118}\right)+20\arctan\left(\frac{1}{6072}\right)$$