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 A118633 #8 Oct 14 2018 11:52:34 %S A118633 1,38,120,58,122,258,889,1025,5238,8362,2675,5799,10012,21038,83049, %T A118633 94075,57086,68112,21223,32249,94260,6286,6863,3723,3310,170,108,838, %U A118633 875,615,553,392,330,70,44,81,55,92,66,103,338,870,115,548,882,325,560 %N A118633 Start with 1 and repeatedly reverse the digits and add 37 to get the next term. %C A118633 After 34 steps enters a cycle of length 27. %H A118633 N. J. A. Sloane and others, <a href="/wiki/Sequences_of_RADD_type">Sequences of RADD type</a>, OEIS wiki. %H A118633 <a href="/index/Rec#order_27">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, 1). %t A118633 NestList[IntegerReverse[#]+37&,1,60] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Oct 14 2018 *) %Y A118633 Cf. A117828, A117816, A117817. %K A118633 base,nonn %O A118633 1,2 %A A118633 Luc Stevens (lms022(AT)yahoo.com), May 09 2006