I honestly do think it's a brilliant mechanic. It is the most basic of maths and there's an elegance in it's simplicity..

If it was triple digit figures or something I could understand that. Omg is 907 a prime number? is it divisible by 3?

But really it barely even enters double digits. Probably one ifbtheu best things we has done recently. Nice to see something new as a mechanic instead of a rehash of something we've seen hundreds of times.