Third time’s a charm: just weeks after cracking an elusive problem involving the number 42, mathematicians have found a solution to an even harder problem for the number 3. Andrew Booker at Bristol ...

The number pi, which is celebrated with its own day on 14 March, has inspired “Pilish” – a fiendishly challenging form of writing. There’s even a Pilish novel. Give it a go yourself, it can be ...

Julia Collins does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...

On average, there are as many prime numbers for which the sum of decimal digits is even as prime numbers for which it is odd. This hypothesis, first made in 1968, has recently been proven by ...