M000000061

$$\pi=532\arctan\left(\frac{1}{239}\right)+728\arctan\left(\frac{1}{1252}\right)+928\arctan\left(\frac{1}{2855}\right)+400\arctan\left(\frac{1}{58898}\right)+248\arctan\left(\frac{1}{110443}\right)+552\arctan\left(\frac{1}{4841182}\right)$$