The first version of this I saw came from the webcomic in this reddit thread about a prime number that looks like a giraffe. After one commenter showed off thi

The first version of this I saw came from the webcomic in this reddit thread about a prime number that looks like a giraffe. After one commenter showed off this technique, someone else found a minimal prime giraffe: 7. [0] https://www.reddit.com/r/math/comments/7qpfls/does_there_exist_a_prime_number_whose/ https://www.reddit.com/r/math/comments/7qpfls/does_there_exi...