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 A118217 #10 Sep 11 2023 17:23:51 %S A118217 1,71,87,148,911,189,1051,1571,1821,1351,1601,1131,1381,1901,1161, %T A118217 1681,1931,1461,1711,1241,1491,2011,1172,2781,1942,2561,1722,2341, %U A118217 1502,2121,1282,2891,2052,2572,2822,2352,2602,2132,2382,2902,2162,2682,2932,2462 %N A118217 Start with 1 and repeatedly reverse the digits and add 70 to get the next term. %C A118217 Never cycles (see A117816). %H A118217 Harvey P. Dale, <a href="/A118217/b118217.txt">Table of n, a(n) for n = 1..1000</a> %H A118217 N. J. A. Sloane and others, <a href="/wiki/Sequences_of_RADD_type">Sequences of RADD type</a>, OEIS wiki. %t A118217 NestList[IntegerReverse[#]+70&,1,50] (* _Harvey P. Dale_, Sep 11 2023 *) %Y A118217 Cf. A117828, A117816, A117817. %K A118217 base,nonn,less %O A118217 1,2 %A A118217 Luc Stevens (lms022(AT)yahoo.com), May 14 2006