As I mentioned last summer, I do enjoy whiling away a few hours attempting to solve the maths / progamming challenges set on Project Euler. My language of choice for most puzzles is C#, but this hampered me on some of the questions as there is no in-built support for really big integers.

However, a little bit of Googling and I came across this excellent BigInteger class on Code Project which does everything I need and more - and it seems bloody fast, too. Thanks to this class, I've been able to knock off several more problems this weekend, and now have a rating of "11% Genius" - still some way to go, then...