What's new

prime numbers posts

Prime number brainteaser Brainteaser

by David Shaw, 9 March 2023 | 1 comments

Brain icon

Difficulty: Extreme 123,456,789 is not a prime number. Is it possible to reorder its digits to give a prime number?

Continue reading Prime number brainteaser


Catching a colossal prime News

by David Shaw, 1 March 2018 | 0 comments

Picture of numbers arranged in a disorganised pattern with some on their sides and some sight side up.

Late last year, Jonathan Pace’s computer found something special. Jonathan is an electrical engineer who also manages computers for charities, so he has a lot of computers, but this one was nothing out of the ordinary. Except for one thing: the computer was running software from the Great Internet Mersenne Prime Search

Continue reading Catching a colossal prime


Celtic knots Activity

by David Shaw, 3 June 2014 | 0 comments

A hole in the woven pattern.

For over a thousand years, people have been drawing intricate woven patterns known as Celtic knots. As we’re about to find out, there’s a lot of maths involved!

Continue reading Celtic knots