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%I #12 Nov 29 2019 01:36:04
%S 2,3,8,10,11,12,14,15,17,18,19,21,26,27
%N Nonsquares mod 29.
%e Since 12 is not a perfect square and there are no solutions to x^2 = 12 mod 29, 12 is in the sequence.
%e Although 13 is not a perfect square either, there are solutions to x^2 = 13 mod 29, such as x = 10, x = 19, so 13 is not in the sequence.
%t Complement[Range[0, 28], PowerMod[Range[29], 2, 29]] (* _Alonso del Arte_, Nov 29 2019 *)
%o (Scala) val squaresMod29 = (1 to 29).map(n => n * n).map(_ % 29)
%o (0 to 28).diff(squaresMod29) // _Alonso del Arte_, Nov 29 2019
%Y Cf. A010391.
%K nonn,fini,full
%O 1,1
%A _N. J. A. Sloane_
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