Machin-like formulae
M000217
$$\pi=176\arctan\left(\frac{1}{57}\right)-20\arctan\left(\frac{1}{239}\right)+48\arctan\left(\frac{1}{348}\right)-48\arctan\left(\frac{1}{97232}\right)+48\arctan\left(\frac{1}{110443}\right)$$
Compact formula
176[57] - 20[239] + 48[348] - 48[97232] + 48[110443]
Lehmer's measure
1.78220
References
HCL (1995 - corrected 5Aug13)
(full reference coming soon)