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 A118879 #10 Mar 05 2020 14:15:58 %S A118879 1016,6106,6021,1211,1126,6216,6131,1321,1236,6326,6241,1431,1346, %T A118879 6436,6351,1541,1456,6546,6461,1651,1566,6656,6571,1761,1676,6766, %U A118879 6681,1871,1786,6876,6791,1981,1896,6986,6901,1101,1016,6106,6021 %N A118879 Let T(S,Q) be the sequence obtaining by starting with S and repeatedly reversing the digits and adding Q to get the next term. This is T(1016,5), the first S for which T(S,5) reaches a cycle of length 36. %C A118879 The cycle is simply the first 36 terms, which then repeat. %C A118879 For S < 1016, T(S,5) reaches a cycle of length 207 (cf. A117800). %H A118879 N. J. A. Sloane and others, <a href="/wiki/Sequences_of_RADD_type">Sequences of RADD type</a>, OEIS wiki. %H A118879 <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). %t A118879 NestList[IntegerReverse[#]+5&,1016,40] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Mar 05 2020 *) %Y A118879 Cf. A117828, A117800, A118878. %K A118879 nonn,base %O A118879 0,1 %A A118879 _N. J. A. Sloane_, May 26 2006