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 A165115 #4 Mar 30 2012 17:28:44 %S A165115 0,16,48,320,400,2256,3712,3856,5168,5312,5456,34960,40080,41520, %T A165115 42240,49520,55360,183696,250592,308992,322096,323392,388992,419888, %U A165115 440192,446096,448688,454592,505792,511696,512992,3496800,3916640,31531872 %N A165115 Consider the base-9 Kaprekar map n->K(n) defined in A165110. Sequence gives numbers belonging to cycles, including fixed points. %C A165115 Initial terms in base 9: 0, 17, 53, 385, 484, 3076, 5074, 5254, 7072, 7252. %H A165115 Joseph Myers, <a href="/A165115/b165115.txt">Table of n, a(n) for n=1..7826</a> %H A165115 <a href="/index/K#Kaprekar_map">Index entries for the Kaprekar map</a> %Y A165115 Union of A165114 and A165117. Cf. A165110, A165116, A165119, A165121, A165128, A165124. %Y A165115 In other bases: A163205 (base 2), A164998 (base 3), A165017 (base 4), A165037 (base 5), A165056 (base 6), A165076 (base 7), A165095 (base 8), A164716 (base 10). %K A165115 base,nonn %O A165115 1,2 %A A165115 _Joseph Myers_, Sep 04 2009