Machin-like formulae
M000344
$$\pi=16\arctan\left(\frac{1}{5}\right)-4\arctan\left(\frac{1}{237}\right)+4\arctan\left(\frac{1}{28322}\right)$$
Compact formula
16[5] - 4[237] + 4[28322]
Lehmer's measure
2.07638
References
STØRMER (1896)
(full reference coming soon)