I think the most interesting bit of trivia here is the discussion of Bertelsen's Number: 50847478, which is famous as being a published but incorrect count of t

I think the most interesting bit of trivia here is the discussion of Bertelsen's Number: 50847478, which is famous as being a published but incorrect count of the primes less than 1e9. 50847534 is the correct answer, but the incorrect number was derived in the 19th century and has persisted in textbooks through the 20th. In some ways, with computers, this is pretty trivial; what's impressive is that this was computed long before computers were available, and although incorrect, was remarkably close. Computers have spoiled us.