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I am writing notes for my students under the topic of prime factorization and I needed to illustrate the Sieve of Eratosthenes and this is what I came up with in tikz:
\documentclass{article}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}[scale=0.65]
\draw[very thick,red] (3,9)--(4,10);
...