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 Sep 11 revised Boy Born on a Tuesday - is it just a language trick? added 154 characters in body Sep 11 answered Boy Born on a Tuesday - is it just a language trick? Sep 8 comment We can divide $7^{17} - 7^{15}$ by? I hope this was a multiple choice question, because 6 is not the only answer. There's 1, 2, 3, 4, 6, 7, 8, 12, etcetera. 160 divisors in all :-) Sep 8 comment We can divide $7^{17} - 7^{15}$ by? 7^17 - 7^15 = 7^2 * 7^15 - 1 * 7^15 = (7^2 - 1) * 7^15 Sep 8 comment We can divide $7^{17} - 7^{15}$ by? 7^17 - 7^15 = (7^2 - 1) * 7^15 = (49 - 1) * 7^15 = 48 * 7^15. No division required. Sep 8 awarded Enthusiast Sep 3 awarded Commentator Sep 3 comment Collinear points theorem @moron: No I hadn't tried it first, but at least it looks like I'm pretty good at choosing a title for my question! :-) Thanks for the link. +1 Sep 3 accepted Liouville's number revisited Sep 3 awarded Scholar Sep 3 accepted Collinear points theorem Sep 3 comment Collinear points theorem Looks like AC and DF don't even have to be parallel. Sep 3 comment Collinear points theorem That's it, thanks. Problem is that you can only google it if you know what it's called! Sep 3 asked Collinear points theorem Aug 28 comment How to explain Real Big Numbers? IMO your RSA example is exactly the problem: at least some people seem to think they can grasp 10^500. I was wondering how to explain the magnitude of such a number such that they might have an aha-experience (or maybe uh-oh). Aug 28 revised How to explain Real Big Numbers? added 4 characters in body Aug 28 revised How to explain Real Big Numbers? added 84 characters in body; added 16 characters in body Aug 28 asked How to explain Real Big Numbers? Aug 28 awarded Student Aug 28 comment Is it possible to represent every huge number in abbreviated form? I count 521 digits in the larger number