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%I
%S 0,1,4,6,9,11,14,16,19,21,24
%N Squares mod 25.
%t Union[PowerMod[Range[25], 2, 25]] (* _Alonso del Arte_, Dec 25 2019 *)
%o (Sage) [quadratic_residues(25)] # _Zerinvary Lajos_, May 24 2009
%o (Scala) (1 to 25).map(n => (n * n) % 25).toSet.toSeq.sorted // _Alonso del Arte_, Dec 25 2019
%Y Cf. A028738.
%K nonn,fini,full,easy
%O 1,3
%A _N. J. A. Sloane_
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