Machin-like formulae
M000343
$$\pi=16\arctan\left(\frac{1}{5}\right)-4\arctan\left(\frac{1}{241}\right)-4\arctan\left(\frac{1}{28800}\right)$$
Compact formula
16[5] - 4[241] - 4[28800]
Lehmer's measure
2.07473
References
STØRMER (1896)
(full reference coming soon)