M000000168

$$\pi=19803492\arctan\left(\frac{2}{16840821}\right)+19637688\arctan\left(\frac{1}{24208144}\right)-20692676\arctan\left(\frac{1}{54610269}\right)+41908120\arctan\left(\frac{1}{100656977}\right)-9271456\arctan\left(\frac{2}{322564791}\right)+4959324\arctan\left(\frac{1}{179734612}\right)+3649280\arctan\left(\frac{1}{243608253}\right)-7232320\arctan\left(\frac{1}{385231007}\right)-32670944\arctan\left(\frac{1}{1304967682}\right)-27146184\arctan\left(\frac{1}{1948043651}\right)+1557700\arctan\left(\frac{2}{4532659739}\right)+34072088\arctan\left(\frac{2}{4949475989}\right)-11972636\arctan\left(\frac{1}{18986886768}\right)+10438408\arctan\left(\frac{1}{194648028089}\right)-26987860\arctan\left(\frac{2}{520629831511}\right)$$