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@hyuki0000
Created June 2, 2017 13:44
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正の整数の分類
$n$を正の整数とする。$n$を割り切る正の整数が$1$個しかないとき、$n$を<b>単数</b>という。ちょうど$2$個あるとき、$n$を<b>素数</b>という。$3$個以上あるとき、$n$を<b>合成数</b>という。
$$
\begin{array}{|c|c|c|c|c|c|c|c|c|c}
\hline
\textbf{単数} & 1 & & & & & & & & & & \\
\hline
\textbf{素数} & & 2 & 3 & & 5 & & 7 & & & & \\
\hline
\textbf{合成数} & & & & 4 & & 6 & & 8 & 9 & 10 & \\
\hline
\end{array}
$$
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