Off-topic. We are into maths for this post. Gotten this URL from Weisiong. Extracting the interesting beginning:
Start with any natural number, such as 69534891. Count the number of even digits, the number of odd digits, and the total number of digits. In this case, there are three evens, five odds, and a total of eight digits. Use these three numbers as digits to form a new number: 358.
Repeat the steps with the new number, counting evens, odds, and the total number of digits. You get 123. If you perform the same set of operations on 123, you get 123 again.
Try another number: 141592653589793238462643383279502884197169399375105820974. Counting 0 as even, there are 24 evens, 33 odds, and 57 digits in total. Applying the process to 243357 gives 246, then 303, then 123.
In fact, no matter what number you start with, this iterative process always leads to 123.
Michael W. Ecker describes the number 123 as a “mathemagical black hole” with respect to this particular process. “Once you hit 123, you never get out,” he says, “just as reaching a black hole of physics implies no escape.”
The full article goes here, enjoy 🙂