M000000065

$$\pi=3388\arctan\left(\frac{1}{1710}\right)+1992\arctan\left(\frac{1}{2855}\right)+2324\arctan\left(\frac{2}{9349}\right)-664\arctan\left(\frac{1}{58898}\right)-2412\arctan\left(\frac{1}{110443}\right)-2128\arctan\left(\frac{2}{2513489}\right)+1084\arctan\left(\frac{1}{4841182}\right)$$