Blog posts with problems to get your brain going! You get a new problem every fortnight and the solutions are published later.

If you want the problems delivered to your inbox be sure to subscribe to the Problems newsletter.

The next problem is scheduled for Sunday, 15th of November.

You may notice some problems are missing... I'm still migrating articles from my old blog.


\(n\) mathematicians with numbered party hats gather around in a circle... It is a matter of life or death!


Is it true that every integer you can think of has a multiple written out only with \(0\)s and \(1\)s?

In this post I talked about the riddle of the water buckets. Now I challenge you to prove that in some situations it is impossible to solve it!