<?xml version="1.0"?>
<div><span class="kw">theorem </span><a NAME="T33"><span class="comment"><font color="firebrick">:: NAT_6:33</font></span><br/></a><div class="add">5 is  <a href="nat_6.html#V2" title="NAT_6:attr.2">Proth</a> </div></div>
