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Nonsquares mod 27.
1

%I #9 Nov 27 2019 01:38:14

%S 2,3,5,6,8,11,12,14,15,17,18,20,21,23,24,26

%N Nonsquares mod 27.

%t Complement[Range[0, 26], PowerMod[Range[27], 2, 27]] (* _Alonso del Arte_, Nov 27 2019 *)

%o (Scala) val squaresMod27 = (0 to 26).map(n => n * n).map(_ % 27)

%o (0 to 26).diff(squaresMod27) // _Alonso del Arte_, Nov 27 2019

%Y Cf. A010389.

%K nonn,fini,full

%O 1,1

%A _N. J. A. Sloane_