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Squares mod 68.
0

%I #12 Jan 28 2018 02:28:10

%S 0,1,4,8,9,13,16,17,21,25,32,33,36,49,52,53,60,64

%N Squares mod 68.

%o (Sage) [quadratic_residues(68)] # _Zerinvary Lajos_, May 24 2009

%K nonn,fini,full

%O 1,3

%A _N. J. A. Sloane_