Indices

An account of methods for finding whether or not a number can be written as the sum of two or more squares or as the sum of two or more cubes.

Tom writes about expressing numbers as the sums of three squares.

Peter Zimmerman from Mill Hill County High School in Barnet, London gives a neat proof that: 5^(2n+1) + 11^(2n+1) + 17^(2n+1) is divisible by 33 for every non negative integer n.

We are used to writing numbers in base ten, using 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. Eg. 75 means 7 tens and five units. This article explains how numbers can be written in any number base.

This article for students and teachers tries to think about how long would it take someone to create every possible shuffle of a pack of cards, with surprising results.

An introduction to coding and decoding messages and the maths behind how to secretly share information.