M000000028

$$\pi=2324\arctan\left(\frac{1}{1252}\right)+3056\arctan\left(\frac{1}{2855}\right)+1064\arctan\left(\frac{1}{5827}\right)+1464\arctan\left(\frac{1}{58898}\right)+780\arctan\left(\frac{1}{110443}\right)+2148\arctan\left(\frac{1}{4841182}\right)-1064\arctan\left(\frac{1}{1561886607}\right)$$