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    Conjecture   
 is a prime iff 
 
 is a prime iff 
 Bibliography
[BBBG] Borwein, D.; Borwein, J. M., Borwein, P. B., and Girgensohn, R. "Giuga's Conjecture on Primality", American Mathematical Monthly, 103, 40–50, (1996)
* indicates original appearance(s) of problem.
          
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