3
\documentclass{article}
\usepackage{fancyhdr}
\usepackage{enumerate}
\pagestyle{fancy}

\begin{document}
\begin{description}
\item[1.]
\begin{enumerate}[(a)]
\item Factor $2^{15}-1=3$
\item Find an integer 
\item Find an integer
\item Find an integer
\end{enumerate}
\end{description}
\end{document}

Here is the result:

enter image description here

Then how to align this list?

Thanks.

  • description has a different alignment. Use enumerate instead. But if you want to personalize the item labels, use the package as cited by @Ian. – Sigur Jan 10 '14 at 13:42
3

Use two enumerate environments.

\documentclass{article}
\usepackage{enumerate}
\begin{document}
\begin{enumerate}[1.]
\item
\begin{enumerate}[(a)]
\item Factor $2^{15}-1=3$
\item Find an integer
\item Find an integer
\item Find an integer
\end{enumerate}
\end{enumerate}
\end{document}

enumerate

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