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 A118617 #12 Aug 28 2021 19:24:17 %S A118617 1,32,54,76,98,120,52,56,96,100,32,54,76,98,120,52,56,96,100,32,54,76, %T A118617 98,120,52,56,96,100,32,54,76,98,120,52,56,96,100,32,54,76,98,120,52, %U A118617 56,96,100,32,54,76,98,120,52,56,96,100,32,54,76,98,120,52,56,96,100,32,54 %N A118617 Start with 1 and repeatedly reverse the digits and add 31 to get the next term. %C A118617 After 1 step enters a cycle of length 9. %H A118617 N. J. A. Sloane and others, <a href="/wiki/Sequences_of_RADD_type">Sequences of RADD type</a>, OEIS wiki. %H A118617 <a href="/index/Rec#order_09">Index entries for linear recurrences with constant coefficients</a>, signature (0, 0, 0, 0, 0, 0, 0, 0, 1). %t A118617 NestList[FromDigits[Reverse[IntegerDigits[#]]]+31&,1,70] (* _Harvey P. Dale_, Dec 25 2012 *) %t A118617 NestList[IntegerReverse[#]+31&,1,70] (* _Harvey P. Dale_, Aug 28 2021 *) %Y A118617 Cf. A117828, A117816, A117817. %K A118617 base,nonn,less,easy %O A118617 1,2 %A A118617 Luc Stevens (lms022(AT)yahoo.com), May 08 2006