# Carmichael numbers - 561 (contd)

## Primary tabs

\documentclass{article}
% this is the default PlanetMath preamble.  as your knowledge
% of TeX increases, you will probably want to edit this, but
% it should be fine as is for beginners.

% almost certainly you want these
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{amsfonts}

% need this for including graphics (\includegraphics)
\usepackage{graphicx}
% for neatly defining theorems and propositions
\usepackage{amsthm}

% making logically defined graphics
%\usepackage{xypic}
% used for TeXing text within eps files
%\usepackage{psfrag}

% there are many more packages, add them here as you need them

% define commands here

\begin{document}
Any  natural  number  multiple  of (12 +i), (22 + i), (34 + i)  and
(56+ i)  is  a  valid base  for  pseudoprimality  of 561  in
Z(i). 40  is  the  order  of these   bases  (mod  561 ).
nd{document}