Machin-like formulae

M000054

$$\pi=40472\arctan\left(\frac{1}{34208}\right)+91704\arctan\left(\frac{1}{44179}\right)-27056\arctan\left(\frac{2}{362619}\right)+14324\arctan\left(\frac{1}{275807}\right)-7528\arctan\left(\frac{1}{619858}\right)-3104\arctan\left(\frac{1}{734557}\right)-39408\arctan\left(\frac{1}{6826318}\right)+24224\arctan\left(\frac{1}{7626068}\right)-21120\arctan\left(\frac{1}{21072618}\right)$$
Compact formula40472[34208] + 91704[44179] - 27056[362619/2] + 14324[275807] - 7528[619858] - 3104[734557] - 39408[6826318] + 24224[7626068] - 21120[21072618]
Lehmer's measure1.58108
References
HCL (13Jul01)(ΒΆΒΆ1.87533) (full reference coming soon)
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