Scott Edwards supadupa at
Fri Nov 20 14:02:27 MST 2009

On Fri, Nov 20, 2009 at 1:06 PM, Sasha Pachev <sasha at> wrote:
> I just came up with this while teaching my son about numbers. Let's
> see how quickly somebody figures this out.
> If you had a 64 bit number written down in hex, how could you quickly
> tell without the aid of any computational device, including pencil or
> paper if it is divisible by 15?
> How about 17?

My own brain is a computational device, isn't it?  Did you all just cheat? ;)

Easy, I'd ask someone else to do it for me. :-D

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