M000000078

$$\pi=3232\arctan\left(\frac{1}{1118}\right)+1396\arctan\left(\frac{1}{5283}\right)-372\arctan\left(\frac{2}{47761}\right)-332\arctan\left(\frac{1}{97042}\right)+860\arctan\left(\frac{2}{313489}\right)-244\arctan\left(\frac{1}{2733307}\right)+1768\arctan\left(\frac{1}{23747457}\right)+332\arctan\left(\frac{1}{47085845867}\right)$$