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A028803 Nonsquares mod 90. 1

%I

%S 2,3,5,6,7,8,11,12,13,14,15,17,18,20,21,22,23,24,26,27,28,29,30,32,33,

%T 35,37,38,39,41,42,43,44,47,48,50,51,52,53,56,57,58,59,60,62,63,65,66,

%U 67,68,69,71,72,73,74,75,77,78,80,82,83,84,86,87,88,89

%N Nonsquares mod 90.

%t Complement[Range[0, 89], PowerMod[Range[90], 2, 90]] (* _Alonso del Arte_, Jan 03 2020 *)

%o (Scala) (0 to 89).diff((1 to 90).map(n => n * n % 90)) // _Alonso del Arte_, Jan 03 2020

%Y Cf. A010451.

%K nonn,fini,full,easy

%O 1,1

%A _N. J. A. Sloane_

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Last modified September 20 16:50 EDT 2021. Contains 347586 sequences. (Running on oeis4.)