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Re:Recruiting Humans with HTTP Headers by eudox on Friday March 14, 2014 @02:18PM (#7400751)
Maybe what Google did[0], like:

X-Human: Work for us! {first 10-digit prime found in consecutive digits of e}@startup.com

[0] http://www.npr.org/templates/story/story.php?storyId=3916173

Re:Recruiting Humans with HTTP Headers by graylights on Friday March 14, 2014 @02:48PM (#7400939)
I don't even need a computer for that, just use leading zeroes: 0000000002