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May 20, 2012 at 15:52 comment added Gerhard Paseman ... which will be -1 mod N, in a manner akin to the proof of Wilson's theorem. Gerhard "Ask Me About System Design" Paseman, 2012.05.20
May 20, 2012 at 15:43 comment added Gerhard Paseman Your remark regarding primitive roots should be made mod N. Taking N=9 I get 2240 which is not the 21st power of any integer. Also g^phi(N) will be 1, so the result will be a square root of 1 mod N. Gerhard "I Like The Proof Idea" Paseman, 2012.05.20
May 20, 2012 at 12:43 history answered Daniel m3 CC BY-SA 3.0