Truncatable Primes with Dr James Grime...
Check out Brilliant (and get 20% off their premium service): https://brilliant.org/numberphile (sponsor)
Dr James Grime is available for public talks. See his website: http://singingbanana.com
More videos with Dr Grime: http://bit.ly/grimevideos
The Eastaway Prime Pencil (Pack of 11 via Mathsgear): http://bit.ly/357686312646216567629137pencil
Prime number videos: http://bit.ly/primevids
Discuss this video on Brady's subreddit: https://redd.it/92bx0p