https://news.ycombinator.com/item?id=7073976 https://news.ycombinator.com/item?id=7073976 and in particular http://www.reddit.com/r/math/comments/1usu93/1_2_3_4

https://news.ycombinator.com/item?id=7073976 https://news.ycombinator.com/item?id=7073976 and in particular http://www.reddit.com/r/math/comments/1usu93/1_2_3_4_5_112_numberphile/ http://www.reddit.com/r/math/comments/1usu93/1_2_3_4_5_112_n...