An <a href="https://en.wikipedia.org/wiki/Erd%C5%91s-Diophantine_graph" class="extiw" title="en:Erdős-Diophantine graph">Erdős-Diophantine graph</a> with five points.
<a href="//commons.wikimedia.org/wiki/User:David_Eppstein" class="mw-redirect" title="User:David Eppstein">David Eppstein</a>
Own work by uploader.  Based on a previous public-domain bitmap image, <a href="https://en.wikipedia.org/wiki/File:5-point_Erd%C5%91s-Diophantine_graph.jpg" class="extiw" title="en:File:5-point Erdős-Diophantine graph.jpg">en:File:5-point Erdős-Diophantine graph.jpg</a>, uploaded August 5, 2007, by <a href="https://en.wikipedia.org/wiki/User:JocK" class="extiw" title="en:User:JocK">en:User:JocK</a>.