M000000530

$$\pi=16\arctan\left(\frac{1}{3}\right)-16\arctan\left(\frac{1}{21}\right)-16\arctan\left(\frac{1}{23}\right)-16\arctan\left(\frac{1}{30}\right)-4\arctan\left(\frac{1}{239}\right)$$

Compact formula	`16[3] - 16[21] - 16[23] - 16[30] - 4[239]`
Lehmer's measure	4.68401