611
xkcd #2922: Pub Trivia
(imgs.xkcd.com)
Alt text:
Bonus question: Where is London located? (a) The British Isles (b) Great Britain and Northern Ireland (c) The UK (d) Europe (or 'the EU') (e) Greater London
I am disappointed in Lemmings' collective lack of Savvy regarding math trivia.
Next thing you'll be telling me you don't know how to prove there's an infinite number of prime twins.