Prime Number Challenge
The series and the main Code Challenge begin in late July but you can get involved now by taking photos of prime numbers you spot in the world around you. Post them on our Facebook wall or tweet them to @bbccode (links for both on right). Alternatively, tag them 'bbccode' on your photo sharing website of choice.
Once we have the first 100 primes captured we'll release a clue to get you all a little bit closer to cracking the Code Challenge. A further clue will be released after 200 primes and a final clue after 300.
By submitting your photos, you agree to allow us to share them on our Facebook page and our blog.
Learn more with The Open University
For your free set of maths puzzles and treasure hunt tips, plus the chance to play an enhanced version of one of The Code games, visit The Open University.OU on the BBC: The Code
The Code: Revealing the secret
Marcus du Sautoy on the extraordinary information maths can show us: "We interview an ex-FBI agent who uses mathematical equations to locate serial killers."Read and comment on Marcus's post on the BBC TV blog