The On-Line Encyclopedia of Integer Sequences

I am not sure if I already blogged this but it's good enough to blog again: The On-Line Encyclopedia of Integer Sequences. I randomly entered '1,8,14,21' and found that it belongs to the sequence: "Numbers n with property that 9*n is a sum of two distinct positive cubes". Good to know! [Slightly irrelevant image from one of my favorite blogs, Futility Closet. Highly recommended!]

Cool JavaScript Demos

http://www.dhteumeuleu.com/ has a bunch of interesting JavaScript demos and toys. I like this one and this one, but I think there are more that are worth a look.

Greydon Square: The Compton Effect