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 A083823 #8 Aug 23 2014 13:38:12 %S A083823 15,18,114,1107,11004,110007,1100004,11000007,110000004,1100000007, %T A083823 11000000004,110000000007,1100000000004,11000000000007, %U A083823 110000000000004,1100000000000007,11000000000000004,110000000000000007,1100000000000000004,11000000000000000007 %N A083823 a(1) = 15; then numbers obtained at every stage of division by 3 in the following process: multiply by 3, reverse the digits, divide by 3, reverse the digits, multiply by 3, reverse the digit, divide by 3. %C A083823 1. 15 is the smallest number which does not follow a cyclic pattern or terminates at k < 10. 2. A pattern is visible. For 12 one gets the cyclic pattern 12->36->63->21->12->36... for 14 one gets 14 ->42->24->8->8... Subsidiary sequences that could be considered: (1) Sequence of numbers which show cyclic pattern. (2) Sequence of numbers which terminate at k,k <10. (3) Numbers which gare not members of (1) and (2). %e A083823 *15->45->54->*18->81->243->342->*114->411->1233->3321->*1107->7011->21033->33012->*11004-> %e A083823 Numbers marked with * are members. %Y A083823 Cf. A083822, A083824, A083825. %K A083823 base,easy,nonn %O A083823 1,1 %A A083823 _Amarnath Murthy_ and Meenakshi Srikanth (menakan_s(AT)yahoo.com), May 08 2003