M000000534

$$\pi=4\arctan\left(\frac{1}{2}\right)+4\arctan\left(\frac{1}{3}\right)+4\arctan\left(\frac{1}{13}\right)-4\arctan\left(\frac{1}{23}\right)-4\arctan\left(\frac{1}{30}\right)$$

Compact formula	`4[2] + 4[3] + 4[13] - 4[23] - 4[30]`
Lehmer's measure	7.72689