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 A118296 #13 Jan 08 2024 06:55:21 %S A118296 21,13,32,24,43,35,54,46,65,57,76,68,87,79,98,90,10,2,3,4,5,6,7,8,9, %T A118296 10,2,3,4,5,6,7,8,9,10,2,3,4,5,6,7,8,9,10,2,3,4,5,6,7,8,9,10,2,3,4,5, %U A118296 6,7,8,9,10,2,3,4,5,6,7,8,9,10,2,3,4,5,6,7,8,9,10,2,3,4,5,6,7,8,9,10,2,3,4,5,6 %N A118296 Start with 21 and repeatedly reverse the digits and add 1 to get the next term. %C A118296 After 17 steps enters a cycle of length 9. %H A118296 N. J. A. Sloane and others, <a href="/wiki/Sequences_of_RADD_type">Sequences of RADD type</a>, OEIS wiki. %H A118296 <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). %Y A118296 Cf. A118551. %Y A118296 Essentially the same as A118513. %K A118296 base,nonn,easy %O A118296 1,1 %A A118296 Luc Stevens (lms022(AT)yahoo.com), May 14 2006 %E A118296 New a(13)=87 inserted by _Georg Fischer_, Jul 17 2020