The Great Courses Plus (free trial): http://ow.ly/RqOr309wT7v This video features Alex Bellos. More info and links in full description. Extra footage with Alex and coloring: https://www.youtube.com/watch?v=w8nc8wbgXPU Or real-time video of the coloring: https://www.youtube.com/watch?v=wH141HLD57o Our previous Collatz Conjecture video: https://www.youtube.com/watch?v=5mFpVDpKX70 The Collatz Colouring image is included in the book Visions of the Universe (USA NAME) and/or Visions of Numberland (UK NAME). Alex Bellos books on Amazon: http://bit.ly/BellosBooks More Alex Bellos videos: http://bit.ly/Bellos_Playlist Edmund Harriss: http://www.mathematicians.org.uk/eoh/ Coloring by Tiffany Arment: https://twitter.com/tiffanyarment Music by Alan Stewart. Talk about this video on Brady's subreddit if you like: https://redd.it/6202kx Here's a blog post with everything neatly pulled together: http://www.bradyharanblog.com/blog/the-collatz-conjecture-in-colour Numberphile is supported by the Mathematical Sciences Research Institute (MSRI): http://bit.ly/MSRINumberphile We are also supported by Science Sandbox, a Simons Foundation initiative dedicated to engaging everyone with the process of science. NUMBERPHILE Website: http://www.numberphile.com/ Numberphile on Facebook: http://www.facebook.com/numberphile Numberphile tweets: https://twitter.com/numberphile Subscribe: http://bit.ly/Numberphile_Sub Videos by Brady Haran Patreon: http://www.patreon.com/numberphile Brady's videos subreddit: http://www.reddit.com/r/BradyHaran/ Brady's latest videos across all channels: http://www.bradyharanblog.com/ Sign up for (occasional) emails: http://eepurl.com/YdjL9 Note: The Great Courses Plus is currently available to watch through a web browser to almost anyone in the world and optimized for the US market. The Great Courses Plus is currently working to both optimize the product globally and accept credit card payments globally. Also note, with an annual membership, subscriptions are $14.99 per month as Brady mentioned. With a monthly membership, subscriptions are $19.99 per month.