M000003520

$$\pi=12\arctan\left(\frac{1}{5}\right)+8\arctan\left(\frac{1}{15}\right)-4\arctan\left(\frac{1}{18}\right)+12\arctan\left(\frac{1}{21}\right)-4\arctan\left(\frac{1}{34}\right)-4\arctan\left(\frac{1}{55}\right)+8\arctan\left(\frac{1}{81}\right)-8\arctan\left(\frac{1}{467}\right)$$

Compact formula	`12[5] + 8[15] - 4[18] + 12[21] - 4[34] - 4[55] + 8[81] - 8[467]`
Lehmer's measure	5.96005