Re: listening to pi: Try the new improved (thanks to David Applegate) "listen" button on the OEIS. A000796 is dec. exp. of pi, A001203 is the cont. fraction and sounds a lot better. You can choose any of the 128 musical instruments that MIDI can synthesize (try #102!). 10,000 digits or 20,000 terms of the cont. frac. can be played By the way,

I'm giving a talk in the Applied Math Dept at MIT on Monday Apr 30 about the OEIS. Tea at 4:00 in Room 4-174 (Math Majors Lounge), talk 4.30-5.30 in Room 2-105. See http://www-math.mit.edu/amc/spring07/ for more information and a link to a nice poster. I'm hoping this will be an opportunity to meet OEIS fans that I've never met as well as to see old friends.

Neil