This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A028749 #9 Jul 08 2025 18:49:14
%S A028749 2,3,5,6,7,8,10,11,12,14,15,17,18,19,20,21,22,23,24,26,27,29,30,31,32,
%T A028749 33,34,35
%N A028749 Nonsquares mod 36.
%t A028749 Complement[Range[0, 35], Table[PowerMod[n, 2, 36], {n, 0, 35}]] (* _Alonso del Arte_, Aug 07 2016 *)
%Y A028749 Cf. A070458.
%K A028749 nonn,fini,full
%O A028749 1,1
%A A028749 _N. J. A. Sloane_