I find these pompous posts from interviewers HILARIOUS! Sure, there should be some coding questions, but not to the point of mathematical riddles (12...9 to equal 2002? Give me a freaking break!). Lots of people code by Googling. The purists would frown on that, but that's the way of the world. You don't reinvent the wheel when someone else has done it. The more an 'expert' you become, the more you realize how much you have to learn. So, keep patting yourselves on the back, chuckling at the way you slam candidates with mind bending mathematical questions. While you are in your tiny cube doing the same monotonous thing over and over, the candidate you happily smacked down have probably written some iPhone apps already and earning twice as much as you. EGO limits your world.