<?xml version="1.0"?>
<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E40">Th19</font></span>: <a NAME="T19"><span class="comment"><font color="firebrick">:: NUMBER09:19</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">n</font> being   <a href="ordinal1.html#NM6" title="ORDINAL1:NM.6">Nat</a>  st <font color="Olive" title="b1">n</font> is  <a href="number09.html#V1" title="NUMBER09:attr.1">a_product_of_two_primes</a>  holds <br/><font color="Olive" title="b1">n</font> <a href="xxreal_0.html#NR2" title="XXREAL_0:NR.2">&gt;=</a> 4</div></div>
