%I #13 Jan 27 2018 06:26:03
%S 0,1,4,9,13,15,16,18,19,21,25,30,33,34,36,42,43,49
%N Squares mod 51.
%o (Sage) [quadratic_residues(51)] # _Zerinvary Lajos_, May 24 2009
%K nonn,fini,full
%O 1,3
%A _N. J. A. Sloane_