Earlier, I wrote: 
> 
>     For Each p In Primes.UpTo(n)
>       ...real code here...
>     Next p
<snip>
> 
> I think something very similar can be done in Ruby, and the 
> implementation of "UpTo" would not be as bulky as the VB equivalent.

It seems I might be wrong, or at least, I don't know how to go about this in
Ruby.  I will give this another try tomorrow, but any Ruby experts who are
able to shed light on this can feel free to jump in now.

Adelle.

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