A Prime in the Post

If you have received a Prime in the Post, we hope you’re enjoying it.

Each number is unique and, if you look carefully, hopefully you can see its location marked on the Ulam Spiral by a tiny pink heart.

For more about the spiral you can check out the Wikipedia article.

Or for a bit more there’s this old Numberphile video with James Grime and see this one with James Clewett.

Thank you for supporting Numberphile - we really appreciate our Patreon supporters and have some plans for more exclusive treats in 2024.