Machin-like formulae
M000424: Hutton's formula
$$\pi=8\arctan\left(\frac{1}{3}\right)+4\arctan\left(\frac{1}{7}\right)$$
Names
Hutton's formula, Vega's formula
Compact formula
8[3] + 4[7]
Lehmer's measure
3.27919
References
*MACHIN (1706)(ΒΆΒΆ6.60113)
(full reference coming soon)