M000000091

$$\pi=69852\arctan\left(\frac{1}{39356}\right)+54796\arctan\left(\frac{1}{51412}\right)+42796\arctan\left(\frac{2}{362619}\right)-6796\arctan\left(\frac{1}{450493}\right)+111644\arctan\left(\frac{1}{1610057}\right)+27340\arctan\left(\frac{1}{6826318}\right)+5476\arctan\left(\frac{1}{7626068}\right)+112376\arctan\left(\frac{1}{21072618}\right)+59220\arctan\left(\frac{1}{103224943}\right)-71172\arctan\left(\frac{1}{2539791558}\right)$$