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%I #17 Dec 17 2021 09:26:33
%S 1,2,3,17,27
%N Number of Giuga sequences of length n.
%D J. M. Borwein, E. Wong: A Survey of Results Relating to Giuga's Conjecture on Primality. Vinet, Luc (ed.): Advances in Mathematical Sciences: CRM's 25 Years. Providence, RI: American Mathematical Society. CRM Proc. Lect. Notes. 11, 13-27 (1997).
%H D. Borwein, J. M. Borwein, P. B. Borwein and R. Girgensohn, <a href="http://dx.doi.org/10.2307/2975213">Giuga's conjecture on primality</a>, The American Mathematical Monthly, Vol. 103, No. 1 (1996), 40-50.
%H R. Mestrovic, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL17/Mestrovic/mes4.html">On a Congruence Modulo n^3 Involving Two Consecutive Sums of Powers</a>, Journal of Integer Sequences, Vol. 17 (2014), 14.8.4.
%Y Cf. A007850.
%K nonn,hard,more,nice
%O 3,2
%A _N. J. A. Sloane_
%E Offset corrected by _Arkadiusz Wesolowski_, Dec 30 2012