Which is 9. So 9 is a square number. Here are some other examples of square numbers. Can you see how all these numbers can be arranged into a square? Which is 64. So 64 is a cube number. Here are some ...

I have found a 3-digit perfect square, a 3-digit perfect cube and a 4-digit triangular number that between them use 10 different digits, with no leading zero. (Triangular numbers are those that fit ...