M000000125

$$\pi=1288\arctan\left(\frac{1}{577}\right)+304\arctan\left(\frac{1}{682}\right)+556\arctan\left(\frac{1}{1393}\right)+624\arctan\left(\frac{1}{12943}\right)+528\arctan\left(\frac{1}{32807}\right)+176\arctan\left(\frac{1}{1049433}\right)$$