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\documentclass{article}
\usepackage[pdftex,a3paper,margin=1pt,landscape]{geometry}
\newcommand\astsLua[1]{%
  \directlua{
    ret = ""
    for  i=1,#1 do
      ret = ret .. "*"
    end
    tex.print("\noexpand\\def\noexpand\\asts{"..ret.."}")
  }
}

\begin{document}
  \astsLua{10000}
\end{document}