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-% Format: AMSTeX
-\documentstyle{amsppt}
-
-\parindent=0pt
-\parskip=\baselineskip
-\hoffset=.75in
-
-\topmatter
-\title \chapter{1} Unsolved Problems\endtitle
-\endtopmatter
-
-\document
-\head{1.1} Odd Perfect Numbers\endhead
-
-A number is said to be {\it 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 {\it odd\/} perfect numbers is
-an open question.
-\enddocument