Machin-like formulae
M000000605
$$\pi=6\arctan\left(\frac{1}{2}\right)+2\arctan\left(\frac{1}{4}\right)-2\arctan\left(\frac{1}{34}\right)-2\arctan\left(\frac{1}{55}\right)-2\arctan\left(\frac{1}{57}\right)$$
Compact formula
6[2] + 2[4] - 2[34] - 2[55] - 2[57]
Lehmer's measure
6.77996