Hey guys, I've just come back from a 2 day holiday and discover my code on rubyquiz.com.. Wow! For my first entry on ruby-quiz (and i'm fairly new to ruby to boot) i'm quite happy :) Cheers all! I've noticed a few comments regarding my use of bitshift, I didn't expect them to be faster (nor intend them to be) but I just tend to think in terms of the binary idioms when it comes to +ve odd numbers, mult/div 2. The fact that I felt the compulsion to write comments next to them indicating what I was doing should probably be an indication that I should have been using more standard notation... Anyways thanks again for making my day :) Cheers, Tristan