The four fours is an entertaining math puzzle related to err... fours. The goal is: construct consecutive numbers with four fours.  In the attached text file, I will present solutions, up to 100 (currently, I will update every week). I dare you try to solve 2179. It is the first unsolved number on dwheeler.com.  :( 123 is also incredibly hard so get a pen and try it out. Of course, I took some but not many solutions from his website, like example 51 and 57. You see everything in the text file here. It is only 4kb so don't hesitate downloading.