This works well and is a lot less complicated than mine!  I still need 
to study it.  With the example below I wanted to suggest that the domain 
omit negative numbers.  It would be nice if the domain also omitted 
non-integers.

   br _13
|domain error: br
|       br _13


Kip

On 12/27/2011 10:16 AM, Raul Miller wrote:
> Best I can come up with at the moment is
>     (([:<.2^.1>.>./@,) (<.@%&2@{.,2&|)@]^:["1 ,"0)
>
> Note that this version does not handle negative numbers.
>
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