I just discovered there is a YouTube channel devoted to number theory. Latest offering here:
http://tinyurl.com/26unyae
...and a few problems (from elsewhere) to play with here:
http://threesixty360.wordpress.com/2010/09/02/its-a-new-newsletter/
(I suspect 4.2.3 has some shortcut solution, though I'm not seeing it?)
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