M000000397

$$\pi=14\arctan\left(\frac{2}{11}\right)+12\arctan\left(\frac{2}{39}\right)+6\arctan\left(\frac{1}{682}\right)$$

Compact formula	`14[11/2] + 12[39/2] + 6[682]`
Lehmer's measure	2.47874
References	Wetherfield, Michael Roby and Chien-Lih, Hwang. Computing pi: Lists of Machin-type (inverse cotangent) identities for pi/4, [Online; accessed 04-February-2024], 2013. [web.archive.org/web/20240204042153/http] [Found by MRW.] Download references as BibTeΧ