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\usepackage{tikz}  \usepackage{pgfplots}  \usepackage{filecontents}  \usepackage{listings}  \begin{document} 
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\section{The algorithm}  The algorithm is as follows:  \begin{verbatim} \begin{lstlisting}  prime: array [1..n] of boolean = all true for p in 2..sqrt(n) loop  if prime[p] then  m = p*p 
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end loop  end if  end loop  \end{verbatim} \end{lstlisting}  \section{Solving the sums, mathematical correct estimate}