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Based on the pi approximation (100 - ((2125^3 + 214^3 + 30^3 + 37^2)/(82^5)))^(1/4), referenced in equation 57 at the referenced URL.
URL: http://mathworld.wolfram.com/PiApproximations.html
URL: http://mathworld.wolfram.com/PiApproximations.html