More from Chalkdust
Prize crossnumber, Issue 19
Can you solve it?
A Ring of Cats and Dogs
We review the first of this year’s nominees for the Book of the Year
Counting palindromes
Alex Xela shows us the world of palindromic numbers, and calculates the chances of getting one
Forget a new £1 coin, we need a £1.23 coin
Not the new coin we want, but the new coin we need
Roots: Pythagoras of Samos
Pythagoras gave us so much more than a² + b² = c²
Puzzles on square grids
How to make Sudoku more interesting