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 A118636 #16 Aug 05 2025 13:48:25 %S A118636 1,41,54,85,98,129,961,209,942,289,1022,2241,1462,2681,1902,2131,1352, %T A118636 2571,1792,3011,1143,3451,1583,3891,2023,3242,2463,3682,2903,3132, %U A118636 2353,3572,2793,4012,2144,4452,2584,4892,3024,4243,3464,4683,3904,4133,3354 %N A118636 Start with 1 and repeatedly reverse the digits and add 40 to get the next term. %H A118636 Harvey P. Dale, <a href="/A118636/b118636.txt">Table of n, a(n) for n = 1..1000</a> %H A118636 N. J. A. Sloane and others, <a href="/wiki/Sequences_of_RADD_type">Sequences of RADD type</a>, OEIS wiki. %F A118636 Never reaches a cycle (see A117816). %t A118636 NestList[FromDigits[Reverse[IntegerDigits[#]]]+40&,1,50] (* _Harvey P. Dale_, Dec 26 2010 *) %t A118636 NestList[IntegerReverse[#]+40&,1,50] (* _Harvey P. Dale_, Aug 05 2025 *) %Y A118636 Cf. A117828, A117816, A117817. %K A118636 base,nonn %O A118636 1,2 %A A118636 Luc Stevens (lms022(AT)yahoo.com), May 09 2006