Problems

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, 6th of February.

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

Can you show that perfect compression is impossible?

A waiter at a restaurant gets a group's order completely wrong. Can you turn the table to get two or more orders right?

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