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 A118147 #7 Dec 26 2018 16:30:31 %S A118147 1,51,65,106,651,206,652,306,653,406,654,506,655,606,656,706,657,806, %T A118147 658,906,659,1006,6051,1556,6601,1116,6161,1666,6711,1226,6271,1776, %U A118147 6821,1336,6381,1886,6931,1446,6491,1996,7041,1457,7591,2007,7052,2557 %N A118147 Start with 1 and repeatedly reverse the digits and add 50 to get the next term. %H A118147 N. J. A. Sloane and others, <a href="/wiki/Sequences_of_RADD_type">Sequences of RADD type</a>, OEIS wiki. %F A118147 Never reaches a cycle (see A117816). %t A118147 NestList[IntegerReverse[#]+50&,1,50] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Dec 26 2018 *) %Y A118147 Cf. A117828, A117816, A117817. %K A118147 base,nonn,less %O A118147 1,2 %A A118147 Luc Stevens (lms022(AT)yahoo.com), May 14 2006