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 A118631 #6 Jul 20 2015 11:55:05 %S A118631 1,35,87,112,245,576,709,941,183,415,548,879,1012,2135,5346,6469,9680, %T A118631 903,343,377,807,742,281,216,646,680,120,55,89,132,265,596,729,961, %U A118631 203,336,667,800,42,58,119,945,583,419,948,883,422,258,886,722,261,196,725 %N A118631 Start with 1 and repeatedly reverse the digits and add 34 to get the next term. %C A118631 After 53 steps enters a cycle of length 36. %H A118631 N. J. A. Sloane and others, <a href="/wiki/Sequences_of_RADD_type">Sequences of RADD type</a>, OEIS wiki. %H A118631 <a href="/index/Rec#order_36">Index entries for linear recurrences with constant coefficients</a>, signature (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1). %Y A118631 Cf. A117828, A117816, A117817. %K A118631 base,nonn %O A118631 1,2 %A A118631 Luc Stevens (lms022(AT)yahoo.com), May 09 2006