[abbaselmas]

Sheldon Cooper, the best number 73 (21st prime number), its mirror 37 (12th prime number)

https://www.youtube.com/watch?v=HacqfsV7ug0

[hoseja]

I really dislike base-10 tricks. They are just cute, rarely have any deeper significance.

[abbaselmas]

Also deep dive in the 73 and 37 https://www.youtube.com/watch?v=4DQndnAhdxk