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 exp^[1/2] mod p tommy1729 Ultimate Fellow Posts: 1,493 Threads: 356 Joined: Feb 2009 12/07/2014, 07:52 PM (This post was last modified: 12/10/2014, 10:32 PM by tommy1729.) This is kinda a repost but I want to put attention to this again. consider 2^x mod p where x is a residue mod p for p an odd prime. Now for some p we might define f(x) such that f(f(x)) = 2^x mod p. Im very intrested in how many such p exist and how f behaves. **edit** A naive argument exists that claims about 50% of the primes will do. I assume this is wrong ? **edit** regards tommy1729 « Next Oldest | Next Newest »

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