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 A091391 #5 Oct 09 2013 14:20:17 %S A091391 1,4,11,16,7,12,16,6,8,13,1,5,10,16,1,5,9,15,2,4,7,12,16,5,9,14,2,6,1, %T A091391 8,10,15,3,7,12,0,6,10,4,10,15,0,3,8,12,14,7,9,14,3,8,10,13,2,4,7,12, %U A091391 16,5,7,16,1,6,12,16,6,11,0,4,6,15,0,3,5,9,13,8,15,0,5,10,14,2,9,14,1,7,11 %N A091391 Aronson's mod 17 sequence: "T is the first, fourth, eleventh, sixteenth, seventh, ... letter in this sentence, not counting spaces and commas and all mod 17". %C A091391 Infinite? Periodic? It seems the answers are "Yes and No" because many numbers (such as "tenth") have multiple T's and moreover, in many of these, the T's are spread such that at least one of them will be != 2 mod 17 (2 is important because "second" is the only T-less word) %D A091391 A. J. Aronson, quoted by D. R. Hofstadter in Metamagical Themas, Basic Books, NY, 1985, p. 44. %H A091391 B. Cloitre, N. J. A. Sloane and M. J. Vandermast, <a href="http://www.cs.uwaterloo.ca/journals/JIS/index.html">Numerical analogues of Aronson's sequence</a>, J. Integer Seqs., Vol. 6 (2003), #03.2.2. %Y A091391 Cf. A005224, A091387, A091388, A091389, A091390. %K A091391 easy,nonn,word %O A091391 0,2 %A A091391 _Sam Alexander_, Jan 05 2004