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% Format: LaTeX2e
\documentclass{report}
\setlength{\parskip}{\baselineskip}
\setlength{\parindent}{0pt}
\begin{document}
\chapter{Unsolved Problems}
\section{Odd Perfect Numbers}
A number is said to be \emph{perfect} if it
is the sum of its divisors. For example, $6$ is
perfect because \(1+2+3 = 6\), and $1$, $2$, and $3$
are the only numbers that divide evenly into $6$
(apart from 6 itself).
It has been shown that all even perfect numbers
have the form \[2^{p-1}(2^{p}-1)\] where $p$
and \(2^{p}-1\) are both prime.
The existence of \emph{odd} perfect numbers is
an open question.
\end{document}
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