M000000136

$$\pi=136\arctan\left(\frac{1}{53}\right)+60\arctan\left(\frac{1}{107}\right)+68\arctan\left(\frac{1}{4443}\right)-20\arctan\left(\frac{2}{226043}\right)-20\arctan\left(\frac{1}{109027476193}\right)+20\arctan\left(\frac{2}{3375905320682366575989}\right)$$