On Apr 29, 2007, at 1:14 AM, Mark Day wrote:
<snip>

> This confused me at first, too.  Let's take just the last four  
> digits: 7893.  Counting from the end, double every second digit,  
> leaving the others unchanged.  That gives you: 14, 8, 18, 3 (where  
> 14=7*2 and 18=9*2; the 8 and the 3 are unchanged). Now add up every  
> digit of the resulting sequence: 1+4  +  8 +  1+8  +  3.  Note the  
> "1+4" comes from the 14, and the "1+8" comes from the 18.

Tons, your and philip's responses have definitely cleared this up.  
Now I can begin writing it.
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If you're not living on the edge,
then you're just wasting space.