Saturday

April 19, 2014

April 19, 2014

Posted by **rachel** on Friday, August 31, 2012 at 9:19pm.

- math -
**David Q/R**, Saturday, September 1, 2012 at 4:44amThe answer is any number that isn't one of the following: 7, 11, 15, 19 etc, that is, any integer that can't be expressed in the form (4k-1) for k greater than or equal to 2 (as you've said that n has to be greater than or equal to 6). Having said that, I'd have enormous difficulty proving it!

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