M000003589

$$\pi=-32\arctan\left(\frac{1}{2}\right)+64\arctan\left(\frac{1}{5}\right)+32\arctan\left(\frac{1}{12}\right)+64\arctan\left(\frac{1}{21}\right)-32\arctan\left(\frac{1}{70}\right)+28\arctan\left(\frac{1}{239}\right)-16\arctan\left(\frac{1}{769}\right)-16\arctan\left(\frac{2}{433287}\right)$$

Compact formula	`- 32[2] + 64[5] + 32[12] + 64[21] - 32[70] + 28[239] - 16[769] - 16[433287/2]`
Lehmer's measure	7.93188