The whole point of the video is that asking these kinds of questions even if at first they seem kind of silly or arbitrary often lead to really interesting obse

The whole point of the video is that asking these kinds of questions even if at first they seem kind of silly or arbitrary often lead to really interesting observations. In this case: Dirichlet's theorem on arithmetic progressions [0] [0] https://en.wikipedia.org/wiki/Dirichlet%27s_theorem_on_arithmetic_progressions https://en.wikipedia.org/wiki/Dirichlet%27s_theorem_on_arith...