M000000171

$$\pi=29002772\arctan\left(\frac{1}{36226953}\right)+46329268\arctan\left(\frac{1}{78739287}\right)+55392476\arctan\left(\frac{1}{144235918}\right)+62020556\arctan\left(\frac{2}{322564791}\right)+141523560\arctan\left(\frac{1}{193788912}\right)+5375732\arctan\left(\frac{1}{201229582}\right)+66811928\arctan\left(\frac{1}{284862638}\right)-14261956\arctan\left(\frac{1}{1514342682}\right)-1637580\arctan\left(\frac{2}{4204410541}\right)-8154604\arctan\left(\frac{1}{7427844818}\right)+82332092\arctan\left(\frac{1}{7959681215}\right)-153624104\arctan\left(\frac{1}{18710140581}\right)+42477072\arctan\left(\frac{2}{75525552427}\right)+29427040\arctan\left(\frac{1}{57821838732}\right)+3752632\arctan\left(\frac{2}{1087840667761}\right)+38573116\arctan\left(\frac{1}{169838669284032}\right)$$