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\noindent \textbf{Math 465 - Fall 2019 \\
 Homework 9} \\
Due November 25th, 2019 \vspace{-4mm}\\

\noindent \small \textit{Prime numbers have always fascinated mathematicians, professional and amateur alike. They appear among the integers, seemingly at random, and yet not quite: there seems to be some order or pattern, just a little below the surface, just a little out of reach.
}\\\vspace{1mm} \hfill--- Underwood Dudley

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\item Problem 10-1.1.

\item Show, for $p>5$ that $\left(\frac{-5}{p}\right)=1$ if and only if the sum of the one's and ten's digit of $p$ is odd.  

\end{enumerate}

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