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 A118152 #9 May 26 2014 23:48:47 %S A118152 1,57,131,187,837,794,553,411,170,127,777,833,394,549,1001,1057,7557, %T A118152 7613,3223,3279,9779,9835,5445,5501,1111,1167,7667,7723,3333,3389, %U A118152 9889,9945,5555,5611,1221,1277,7777,7833,3443,3499,9999,10055,55057,75111 %N A118152 Start with 1 and repeatedly reverse the digits and add 56 to get the next term. %C A118152 After 13 steps enters a cycle of 207. %H A118152 N. J. A. Sloane and others, <a href="/wiki/Sequences_of_RADD_type">Sequences of RADD type</a>, OEIS wiki. %t A118152 NestList[FromDigits[Reverse[IntegerDigits[#]]]+56&,1,60] (* _Harvey P. Dale_, Dec 12 2010 *) %Y A118152 Cf. A117828, A117816, A117817. %K A118152 base,nonn,less %O A118152 1,2 %A A118152 Luc Stevens (lms022(AT)yahoo.com), May 14 2006