Machin-like formulae
M000000535
$$\pi=12\arctan\left(\frac{1}{4}\right)-4\arctan\left(\frac{1}{8}\right)-4\arctan\left(\frac{1}{18}\right)+12\arctan\left(\frac{1}{23}\right)+12\arctan\left(\frac{1}{30}\right)$$
Compact formula
12[4] - 4[8] - 4[18] + 12[23] + 12[30]
Lehmer's measure
4.97626