M000000068

$$\pi=76648\arctan\left(\frac{1}{39356}\right)+48000\arctan\left(\frac{1}{51412}\right)+36000\arctan\left(\frac{2}{362619}\right)-6796\arctan\left(\frac{1}{503901}\right)+52424\arctan\left(\frac{1}{734557}\right)-25084\arctan\left(\frac{1}{6826318}\right)+57900\arctan\left(\frac{1}{7626068}\right)+732\arctan\left(\frac{1}{21072618}\right)+33676\arctan\left(\frac{1}{2539791558}\right)+6796\arctan\left(\frac{1}{46641052232}\right)$$