The logarithmic integral li(x) plays a role in number theory because the related function Li(x) = li(x) - li(2) provides an estimate for the number of primes less than x. MATLAB's Symbolic Toolbox has the function logint, but it is not available in basic MATLAB or Cody.
Write a function to evaluate the logarithmic integral.
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George Berken Augusto Mazzei Dyuman Joshi Christian Schröder

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