A weekly challenge concerning prime numbers.
This group tasks allows you to search for arithmetic progressions
in the prime numbers. How many of the challenges will you discover
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.
A game in which players take it in turns to choose a number. Can you block your opponent?
This black box reveals random values of some important, but
unusual, mathematical functions. Can you deduce the purpose of the
An introduction to proof by contradiction, a powerful method of mathematical proof.
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?