M000340

$$\pi=16\arctan\left(\frac{1}{5}\right)-4\arctan\left(\frac{1}{240}\right)-4\arctan\left(\frac{1}{57361}\right)$$
Compact formula16[5] - 4[240] - 4[57361]
Lehmer's measure2.06095
References
STØRMER (1896) (full reference coming soon)