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 A123069 #12 Nov 16 2024 18:16:15 %S A123069 1,3,5,9,11,17,29,41 %N A123069 Odd positive integers that are not the sum of four positive squares. %D A123069 J. H. Conway, The Sensual (Quadratic) Form, M.A.A., 1997, p. 140. %D A123069 L. E. Dickson, History of the Theory of Numbers. Carnegie Institute Public. 256, Washington, DC, Vol. 1, 1919; Vol. 2, 1920; Vol. 3, 1923, see vol. 2, p. 302. %t A123069 sm4=Union[Total/@Tuples[Range[10]^2,4]];Select[Range[1,100,2],!MemberQ[sm4,#]&] (* _James C. McMahon_, Nov 15 2024 *) %Y A123069 Odd terms of A000534. %K A123069 nonn,fini,full %O A123069 1,2 %A A123069 _N. J. A. Sloane_, Sep 27 2006