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 A037046 #16 Nov 11 2015 08:51:01
%S A037046 5,13,17,25,26,29,35,39,41,43,47,50,58,59,61,65,67,71,73,78,83,85,86,
%T A037046 89,94,95,101,103,107,109,113,116,118,119,122,123,125,127,130,131,134,
%U A037046 143,145,146,149,155,163,167,170,173,178,179,181,183,185,188,191,193
%N A037046 Numbers that are not the number of quadratic residues mod n for any n.
%C A037046 Complement of A037041. - _Michel Marcus_, Nov 11 2015
%t A037046 s = Length[Union@ #] & /@ Table[Mod[k^2, n], {n, 10000}, {k, 0, n - 1}]; Complement[Range@ Max@ #, #] &@ Take[Union@ s, 136] (* _Michael De Vlieger_, Nov 10 2015 *)
%Y A037046 Cf. A000224, A096008, A111986 (number of numbers having n quadratic residues), A111987 (least number having n quadratic residues), A111988 (greatest number having n quadratic residues).
%K A037046 nonn
%O A037046 1,1
%A A037046 _David W. Wilson_