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 A118615 #11 Jul 17 2020 16:48:59 %S A118615 1,27,98,115,537,761,193,417,740,73,63,62,52,51,41,40,30,29,118,837, %T A118615 764,493,420,50,31,39,119,937,765,593,421,150,77,103,327,749,973,405, %U A118615 530,61,42,50,31,39,119,937,765,593,421,150,77,103,327,749,973,405,530,61,42 %N A118615 Start with 1 and repeatedly reverse the digits and add 26 to get the next term. %C A118615 After 23 steps enters a cycle of length 18. %H A118615 N. J. A. Sloane and others, <a href="/wiki/Sequences_of_RADD_type">Sequences of RADD type</a>, OEIS wiki. %H A118615 <a href="/index/Rec#order_18">Index entries for linear recurrences with constant coefficients</a>, signature (0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1). %Y A118615 Cf. A117828, A117816, A117817. %K A118615 base,nonn,easy %O A118615 1,2 %A A118615 Luc Stevens (lms022(AT)yahoo.com), May 08 2006 %E A118615 a(23) corrected by _Georg Fischer_, Jul 17 2020