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Squares mod 26.
1

%I #20 Nov 27 2019 01:38:25

%S 0,1,3,4,9,10,12,13,14,16,17,22,23,25

%N Squares mod 26.

%t Union[PowerMod[Range[0, 25], 2, 26]] (* _Alonso del Arte_, Nov 26 2019 *)

%o (Sage) [quadratic_residues(26)] # _Zerinvary Lajos_, May 24 2009

%o (Scala) (0 to 25).map(n => n * n).map(_ % 26).toSet.toSeq.sorted // _Alonso del Arte_, Nov 26 2019

%Y Cf. A028739.

%K nonn,fini,full

%O 1,3

%A _N. J. A. Sloane_