M000000060

$$\pi=6796\arctan\left(\frac{2}{13489}\right)+49464\arctan\left(\frac{1}{39356}\right)+34408\arctan\left(\frac{1}{51412}\right)+29204\arctan\left(\frac{2}{362619}\right)+32036\arctan\left(\frac{1}{734557}\right)-18288\arctan\left(\frac{1}{6826318}\right)+44308\arctan\left(\frac{1}{7626068}\right)+732\arctan\left(\frac{1}{21072618}\right)+26880\arctan\left(\frac{1}{2539791558}\right)$$