Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsNumber-Theoretic Construction of Digital Circleshttp://demonstrations.wolfram.com/NumberTheoreticConstructionOfDigitalCircles/]]>http://demonstrations.wolfram.com/NumberTheoreticConstructionOfDigitalCircles/