I first came across this problem in Gödel, Escher, Bach in the 80s sometime when I first read it. Hofstadter does warn the reader to bring lots of paper when tr

I first came across this problem in Gödel, Escher, Bach in the 80s sometime when I first read it. Hofstadter does warn the reader to bring lots of paper when trying 27. Did I listen? Of course not.