https://github.com/silveira/ulam https://github.com/silveira/ulam Here is a reusable implentation in Javascript using Html5 canvas. You can just download the s

https://github.com/silveira/ulam https://github.com/silveira/ulam Here is a reusable implentation in Javascript using Html5 canvas. You can just download the source, edit and run in your browser. Or see live examples here: http://silveiraneto.net/2013/05/14/twin-primes-visualized-over-an-ulam-spiral-in-html5/ http://silveiraneto.net/2013/05/14/twin-primes-visualized-ov...