looks similar visually to &quot;Patterns in modular Arithmetic&quot;
not sure if they are mathematically same though.<p><a href="http:&#x2F;&#x2F;maxwelldemon.com&#x2F;2011&#x2F;11&#x2F;20&#x2F;22-1-patterns-in-modular-arithmetic&#x2F;" rel="nofollow">http:&#x2F;&#x2F;maxwelldemon.com&#x2F;2011&#x2F;11&#x2F;20&#x2F;22-1-patterns-in-modular-...</a>