An introduction to proof by contradiction, a powerful method of mathematical proof.
This group tasks allows you to search for arithmetic progressions in the prime numbers. How many of the challenges will you discover for yourself?
Take any prime number greater than 3 , square it and subtract one. Working on the building blocks will help you to explain what is special about your results.
Make a line of green and a line of yellow rods so that the lines differ in length by one (a white rod)
How many divisors does factorial n (n!) have?
A game in which players take it in turns to choose a number. Can you block your opponent?
A short challenge concerning prime numbers.