So I just read through the Cicada 3301 wiki and on the last page (link below), in the questions sent to the last puzzle's "solvers," there are a couple references to Douglas Hofstadter.

One of the response options is "Strange Loop," and one of the questions is:

'I am the voice* inside my head (You undoubtedly just thought "I don't have a voice inside my head." That is the voice the question is referring to).'

(If you aren't familiar, these are both references "I Am a Strange Loop", a book by Hofstadter.)

Anyway, the reference to Hofstadter and the mysterious, elaborate, international nature of this Cicada operation reminded me of a previous thing. A book called “Being or Nothingness” by “Joe K” was mysteriously mailed to academics all over the world a few years ago, and I'm not sure anyone ever figured out why. In it, there were references to Hofstadter and other thinkers. Much like Cicada 3301, the whole thing was kind of intriguing and a little creepy.

In "The Psychopath Test" by Jon Ronson, Ronson asks Hofstadter if he had anything to do with the book and Hofstadter said no. And why would he, right, but both the book and this Cicada 3301 thing seem very Hofstadter-esque to me. Just thought that might be worth pointing out.

http://uncovering-cicada.wikia.com/wiki/What_Happened_Part_2...