Before anyone else complains: yes, there were computers in 1961, and had been for over twelve years, but Feynman doesn't use any in the lecture. And certainly Henry Briggs, who calculated the first fourteen-place common log tables and whom Feynman cites in the relevant section, didn't use any in 1620, and the results Feynman presents are far less precise.

And Lecture #22 - "Algebra" - is a thing of beauty. Anyone who likes mathematics will like it.