[ANN] Code Golf Challenge : Oblongular Number Spirals

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Hi all,

For those who found the 1,000 Digits of Pi problem too daunting, here's 
something a little simpler for you.  The new Code Golf[1] challenge 
involves you having to create a number spiral such as :

    1  2  3
   10 11  4
    9 12  5
    8  7  6

and

    1  2  3  4  5
   18 19 20 21  6
   17 28 29 22  7
   16 27 30 23  8
   15 26 25 24  9
   14 13 12 11 10

Seems pretty simple, huh?  The URL to the full challenge description is

   http://codegolf.com/oblongular-number-spirals

I found it more difficult than I first thought it would be, but the code 
was a lot of fun to write.  At the time of writing the best Ruby entry 
is 169 bytes.  Can you beat it?

Regards,
Carl.


[1]  http://codegolf.com/ - "allows you to show off your code-fu by 
trying to solve coding problems using the least number of keystrokes."