Where we follow twizzles to places that no number has been before.

A loopy exploration of z^2+1=0 (z squared plus one) with an eye on winding numbers. Try not to get dizzy!

Make the twizzle twist on its spot and so work out the hidden link.

When is $7^n + 3^n$ a multiple of 10? Can you prove the result by two different methods?

In this article we shall consider how to solve problems such as "Find all integers that leave a remainder of 1 when divided by 2, 3, and 5."

This Sudoku puzzle can be solved with the help of small clue-numbers on the border lines between pairs of neighbouring squares of the grid.