If you’ve been playing Hogwarts Legacy for any lengthy of time, you have probably run into one of the above puzzle doors with triangles and numbers and symbols on them.

Learn about how triangle sequences, quadratic sequences and the common difference with this BBC Bitesize Maths article. For students between the ages of 11 and 14.

You’ll think this number sequence is just another set of digits until you spot the hidden pattern. But will you be able to spot the answer and solve this puzzle?