Elastic Numbers

It’s here! My new book of puzzles Elastic Numbers is now available on Amazon.



Elastic Numbers Cover

I hope you enjoy solving the problems as much as I enjoyed creating them.



The Vault: Powers of two

My new book of maths puzzles is on its way! It’s packed full of interesting problems to sink your teeth into. I’ll post an update as the launch approaches.

In the meantime, here is a fantastic problem from the USA:

It is given that 2^{2004} is a 604-digit number beginning with a 1. How many of the numbers 2^0, 2^1, 2^2, 2^3, ..., 2^{2003} begin with a 4?