## July 6, 2005

I know I'm late, but anyway here is the latest Dimitre's puzzle. Don't post your anwers here, just send them him to dnovatchev AT gmail DOT com. Dimitre will be collecting answers only for another week, so hurry up. I just started reading the book "The Da Vinci code" and ...

## October 14, 2004

Ok, last one: Consider a function which, for a given whole number n, returns the number of ones required when writing out all numbers between 0 and n. For example, f(13) = 6. Notice that f(1) = 1. What is the next largest n such that f(n) = n? Again ...

## October 13, 2004

And what about this one: 1 1 1 2 1 1 2 1 1 1 1 1 2 2 1 What is the next line? I found several solutions, one better and couple of not really, but all of them don't match another property this sequence looks like to be ...

## October 11, 2004

Here is another cool puzzle from google: Solve this cryptic equation, realizing of course that values for M and E could be interchanged. No leading zeros are allowed. WWWDOT - GOOGLE = DOTCOM Should admit I failed to solve it with just a pen and a piece of paper. Or ...

## August 11, 2004

Ok, this is a simple one, if
XML + XSLT = 5
XPATH + XPOINTER = 10
RSS + ATOM = 7
XINCLUDE + RELAXNG = 11
Then what is
XHTML + MATHML = ?
...

## July 10, 2004

Ok, this is not a new one, but just for those who somehow missed it (just like me). A cool puzzle to solve: { First 10 digit prime in consecutive digits of e }.com How much time does it take for you to crack it? My full time is about ...