Matthew Walker mwalker at
Fri Nov 20 14:13:32 MST 2009

On Fri, November 20, 2009 2:02 pm, Scott Edwards wrote:
> 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

Aren't other people a computational device? That'd be cheating too.

Matthew Walker
Kydance Hosting & Consulting, Inc. -
PHP, Perl, and Web Development - Linux Server Administration

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