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 A118635 #6 Jul 20 2015 10:53:21 %S A118635 1,40,43,73,76,106,640,85,97,118,850,97,118,850,97,118,850,97,118,850, %T A118635 97,118,850,97,118,850,97,118,850,97,118,850,97,118,850,97,118,850,97, %U A118635 118,850,97,118,850,97,118,850,97,118,850,97,118,850,97,118,850,97,118 %N A118635 Start with 1 and repeatedly reverse the digits and add 39 to get the next term. %C A118635 After 8 steps enters a cycle of length 3. %H A118635 N. J. A. Sloane and others, <a href="/wiki/Sequences_of_RADD_type">Sequences of RADD type</a>, OEIS wiki. %H A118635 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (0, 0, 1). %Y A118635 Cf. A117828, A117816, A117817. %K A118635 base,nonn %O A118635 1,2 %A A118635 Luc Stevens (lms022(AT)yahoo.com), May 09 2006