I've almost solved all the simplest (5% difficulty) problems on Project Euler now, wow thinks became a lot more fun and interesting in the slightly harder problems. Forces me to really think. Most things seems impossible to brute force the stupid way so one _must_ come up with something smarter. I don't have enough intellectual stamina to do as much math in my spare time as I would like to but I think Project Euler is a good middle way that prevents my brain from totally rotting away. Also I wish I were smarter so I could specialize in number theory. All these morphisms, categories and representations are nice but integers are what is truly beautiful. The queen of mathematics as they say.