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 A118145 #7 May 26 2014 23:48:47 %S A118145 1,48,131,178,918,866,715,564,512,262,309,950,106,648,893,445,591,242, %T A118145 289,1029,9248,8476,6795,6023,3253,3570,800,55,102,248,889,1035,5348, %U A118145 8482,2895,6029,9253,3576,6800,133,378,920,76,114,458,901,156,698,943 %N A118145 Start with 1 and repeatedly reverse the digits and add 47 to get the next term. %C A118145 After 42 steps enters a cycle of 18. %H A118145 N. J. A. Sloane and others, <a href="/wiki/Sequences_of_RADD_type">Sequences of RADD type</a>, OEIS wiki. %t A118145 NestList[FromDigits[Reverse[IntegerDigits[#]]]+47&,1,50] (* _Harvey P. Dale_, Apr 25 2011 *) %Y A118145 Cf. A117828, A117816, A117817. %K A118145 base,nonn,less %O A118145 1,2 %A A118145 Luc Stevens (lms022(AT)yahoo.com), May 14 2006