Numbers Visualisation

Like everything else, numbers can be turned into colors/pixels to produce visualizations. After Ulam's spiral I tryed others configurations. Here are the results I achieved so far using hexagonal spirals (instead of square one), abundance (instead of just prime or not prime) and polynomial increase (instead of just +1) and other things :

• hexagonal spiral
• hexagonal spiral alternate clockwise and couter clockwise
• 2 interleaved spirals
• 6 interleaved spirals
• Klauber triangle
• i,j => 1 number => vis