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 A103585 #17 Apr 30 2014 01:30:12 %S A103585 1,3,3,1,3,3,1,3,3,1,3,1,3,3,1,3,3,1,3,3,1,3,1,3,3,1,3,3,1,3,3,1,3,1, %T A103585 3,3,1,3,3,1,3,3,3,1,3,3,1,3,3,1,3,3,1,3,1,3,3,1,3,3,1,3,3,1,3,1,3,3, %U A103585 1,3,3,1,3,3,1,3,1,3,3,1,3,3,1,3,3,3,1,3,3,1,3,3,1,3,3,1,3,1,3 %N A103585 Consider numbers k such that (A102370(k)-k)/2 = 1; read them mod 4 to get the sequence. %C A103585 Is there a self-contained construction of this two-valued sequence? %C A103585 Sequence appears to have period 43. - _Ralf Stephan_, May 18 2007 %H A103585 David Applegate, Benoit Cloitre, Philippe Deléham and N. J. A. Sloane, Sloping binary numbers: a new sequence related to the binary numbers [<a href="http://neilsloane.com/doc/slopey.pdf">pdf</a>, <a href="http://neilsloane.com/doc/slopey.ps">ps</a>], J. Integer Seq. 8 (2005), no. 3, Article 05.3.6, 15 pp. %e A103585 The numbers k are 1, 3, 7, 9, 11, 15, 17, 19, ... %Y A103585 Cf. A102370, A103587. %K A103585 nonn,base %O A103585 1,2 %A A103585 _Benoit Cloitre_ and _Philippe Deléham_, Mar 24 2005