Li(x) Logarithmic Integral

Li(x) approximates the prime counting function Pi(x). It is computed using the Exponential Integral

Li(x) = Ei(Ln(x)).

See Ri(x) Riemann Prime Counting Function for a better approximation of Pi(x).

See: Logarithmic Integral -- From MathWorld
And: Wolfram Function Evaluation -- LogIntegral

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