Think of a numer between one and... oh, I don't know... let's say ten thousand. Think hard. It can be any number at all.
Got it?
Okay, good. Now go and pay a visit to one of the most remarkable number-based websites I have ever had the pleasure of witnessing: What's Special About This Number?
Was your number 11? This site will pleasantly inform you that 11 is specia because it is the largest known multiplicative persisance. What is a multiplicative persistance? Just click on the handy link and you will find out, via the "Wikipedia of math," Wolfram's Mathworld.
Upon stumbling upon this site, I felt that I had to share it's existence with the world, as I was absoluely humbled by the fact that anyone would have a combination of both the necessary time and the necessary knowledge to come up with something remotely interesting to say about every single number under (but not including) ten thousand.
So, if you haven't done so already, pick a number and go visit this site. If you're anything like me, it will provide you with great enjoyment.