M000000514

$$\pi=16\arctan\left(\frac{1}{4}\right)-16\arctan\left(\frac{1}{21}\right)-4\arctan\left(\frac{1}{408}\right)-4\arctan\left(\frac{1}{577}\right)$$

Compact formula	`16[4] - 16[21] - 4[408] - 4[577]`
Lehmer's measure	3.16247