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 A164731 #14 Jun 02 2017 00:44:08 %S A164731 1,0,1,1,3,3,1,4,3,8,3,16,5,27,8,46,9,73,11,110,16,162,25,231,37,318, %T A164731 58,429,88,572,132,747,192,963,269,1229,372,1551,500,1939,662,2401, %U A164731 864,2948,1115,3586,1421,4330,1792,5194,2240,6191,2764,7338,3382,8650,4105 %N A164731 Number of cycles of n-digit numbers (including fixed points) under the Kaprekar map A151949. %H A164731 Joseph Myers, <a href="/A164731/b164731.txt">Table of n, a(n) for n=1..70</a> %H A164731 H. Hanslik, E. Hetmaniok, I. Sobstyl, et al., <a href="http://yadda.icm.edu.pl/baztech/element/bwmeta1.element.baztech-aeb2e2a6-99ca-4268-8f6b-a947b9c04da9">Orbits of the Kaprekar's transformations-some introductory facts</a>, Zeszyty Naukowe Politechniki Śląskiej, Seria: Matematyka Stosowana z. 5, Nr kol. 1945; 2015. %H A164731 <a href="/index/K#Kaprekar_map">Index entries for the Kaprekar map</a> %Y A164731 Cf. A151949, A164716, A164732, A164733, A164734, A164735, A164736. %Y A164731 In other bases: A004526 (base 2, adjusted to start 1, 0, 0, 1, 1, ...), A165006 (base 3), A165025 (base 4), A165045 (base 5), A165064 (base 6), A165084 (base 7), A165103 (base 8), A165123 (base 9). [_Joseph Myers_, Sep 05 2009] %K A164731 base,nonn %O A164731 1,5 %A A164731 _Joseph Myers_, Aug 23 2009