Exercise for the reader
More from Chalkdust
Quarto in higher dimensions
Peter Rowlett is gonna need a bigger board7 ways to tell if a number is divisible by 7
Łukasz takes us on a tour through a surprisingly diverse range of algorithms to test for divisibility by 7Top ten vote issue 11
Vote for your favourite maths-themed day outToo good to be Truchet
Colin Beveridge looks at different designs for 2- and 3-dimensional tilesIn conversation with Nazar Miheisi
Our first interview celebrating Black Mathematician MonthOur Favourite Functions: Part I
Because we love functions!