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Code to Zero

Find all 3 digit numbers such that by adding the first digit, the square of the second and the cube of the third you get the original number, for example 1 + 3^2 + 5^3 = 135.

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Basic Rhythms

Explore a number pattern which has the same symmetries in different bases.

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Learn about Number Bases

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.

Binary Squares

Stage: 5 Challenge Level: Challenge Level:2 Challenge Level:2

If a number N is expressed in binary by using only 'ones,' what can you say about its square (in binary)?