> > I've been thinking a lot about perfect numbers (numbers who's factors when added up equal the number itself)
>
> OK, does 1 count? Obviously, there's 4... Wouldn't any prime number be a perfect number, or are they excluded on principle? I'm now full of questions on this subject. It seems to me that no number but four could be perfect (unless you count one), unless, of course, I'm not understanding the concept here...
>
> Don "The 'Curious' Monkeyman" Jackson

Never mind, I just went and looked up the concept myself. 4 is NOT a perfect number, nor is 1. I just had the definition wrong in my head. Aliquot parts are a key concept of perfect numbers. See the link for more info if you need it (as I did.)