M000000121

$$\pi=6549636\arctan\left(\frac{1}{3139557}\right)+2875116\arctan\left(\frac{1}{4057165}\right)+782248\arctan\left(\frac{1}{4218932}\right)+3853328\arctan\left(\frac{2}{23866411}\right)-3720088\arctan\left(\frac{2}{90510287}\right)-3743512\arctan\left(\frac{1}{60033932}\right)-4215272\arctan\left(\frac{1}{160007778}\right)+1867396\arctan\left(\frac{1}{173691877}\right)-5928768\arctan\left(\frac{1}{361632045}\right)+4364272\arctan\left(\frac{1}{404744283}\right)+3616892\arctan\left(\frac{1}{773302059}\right)-3806060\arctan\left(\frac{2}{5365629701}\right)+3158820\arctan\left(\frac{1}{3293860443}\right)$$