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September 19, 2014

September 19, 2014

Posted by **josh** on Saturday, January 2, 2010 at 1:59pm.

- math -
**drwls**, Saturday, January 2, 2010 at 2:55pmThe solution is explained here:

http://stanwagon.com/public/TorrenceWagon.pdf

Only locker numbers with an even number of factors remain open. Those turn out to be perfect squares: 1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, .., 900 (31)^2=961

Count them up. I think you will get 31 open lockers

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