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A028742 Nonsquares mod 29. 1

%I

%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,changed

%O 1,1

%A _N. J. A. Sloane_

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Last modified December 9 17:18 EST 2019. Contains 329879 sequences. (Running on oeis4.)