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 A118518 #10 Jun 02 2017 09:00:10
%S A118518 2,5,8,11,14,44,47,77,80,11,14,44,47,77,80,11,14,44,47,77,80,11,14,44,
%T A118518 47,77,80,11,14,44,47,77,80,11,14,44,47,77,80,11,14,44,47,77,80,11,14,
%U A118518 44,47,77,80,11,14,44,47,77,80,11,14,44,47,77,80,11,14,44,47,77,80
%N A118518 Define sequence S_m by: initial term = m, reverse digits and add 3 to get next term. Entry shows S_2. This reaches a cycle of length 6 in 3 steps.
%H A118518 N. J. A. Sloane and others, <a href="/wiki/Sequences_of_RADD_type">Sequences of RADD type</a>, OEIS wiki.
%H A118518 <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (0, 0, 0, 0, 0, 1).
%t A118518 Join[{2,5,8},LinearRecurrence[{0,0,0,0,0,1},{11,14,44,47,77,80},66]] (* _Ray Chandler_, Jul 18 2015 *)
%t A118518 NestList[IntegerReverse[#]+3&,2,70] (* Requires Mathematica version 10 or later *) (* or *) PadRight[{2,5,8},70,{47,77,80,11,14,44}] (* _Harvey P. Dale_, Jun 02 2017 *)
%Y A118518 Cf. A117831, A118517 on.
%K A118518 nonn,base
%O A118518 1,1
%A A118518 _N. J. A. Sloane_, May 06 2006