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 A118090 #8 Feb 03 2021 19:26:01 %S A118090 1,45,98,133,375,617,760,111,155,595,639,980,133,375,617,760,111,155, %T A118090 595,639,980,133,375,617,760,111,155,595,639,980,133,375,617,760,111, %U A118090 155,595,639,980,133,375,617,760,111,155,595,639,980,133,375,617,760 %N A118090 Start with 1 and repeatedly reverse the digits and add 44 to get the next term. %C A118090 After 3 steps enters a cycle of length 9. %H A118090 Harvey P. Dale, <a href="/A118090/b118090.txt">Table of n, a(n) for n = 1..1000</a> %H A118090 N. J. A. Sloane and others, <a href="/wiki/Sequences_of_RADD_type">Sequences of RADD type</a>, OEIS wiki. %t A118090 NestList[IntegerReverse[#]+44&,1,60] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Feb 03 2021 *) %Y A118090 Cf. A117828, A117816, A117817. %K A118090 base,nonn %O A118090 1,2 %A A118090 Luc Stevens (lms022(AT)yahoo.com), May 11 2006