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<a NAME="E1:115"/>
3 <a href="wsierp_1.html#K2">|^</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="pepin.html#K5" target="_self">Fermat</a> 1</span>)</span> <a href="binarith.html#K5">-'</a> 1</span>)</span> <a href="nat_1.html#K3">div</a> 2</span>)</span>, <a href="xcmplx_0.html#K4">-</a> 1 <a href="int_1.html#R1">are_congruent_mod</a>  <a href="pepin.html#K5" target="_self">Fermat</a> 1
 
<b>by </b><i><a class="txt" href="pepin.html#E94"><i><font color="Green">Lemma71</font></i></a></i>;<br/>
<b>hence </b><a NAME="E2:115"/>
5 is <a href="int_2.html#V1">prime</a>
 <b>by </b><i><a class="ref" href="pepin.html#T56" target="_self">Th56</a>, <a class="ref" href="pepin.html#T63" target="_self">Th63</a></i>;<br/>


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