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 A156071 #27 Jul 21 2018 02:42:52 %S A156071 3,38,381,3816,38165,381654,3816547,38165472,381654729 %N A156071 Concatenation chain arising in A156069. %C A156071 a(9) is a zeroless pandigital number in base 10, with 9 digits such that every k-digit substring ( 1 <= k <= 9 ) taken from the left, is divisible by k (see A163574). - _Michel Marcus_, Dec 01 2013 %D A156071 Matt Parker, Things to make and do in the fourth dimension, 2015, pages 7-9. %H A156071 Blaine, <a href="http://puzzles.blainesville.com/2008/01/how-about-math-puzzle.html#comments">How about a math puzzle?</a> %H A156071 Albert Franck, <a href="http://www.paulcooijmans.com/others/puzfrank.html">Puzzles</a>, see item 7. %H A156071 Wikipedia, <a href="https://en.wikipedia.org/wiki/Polydivisible_number">Polydivisible number</a> %H A156071 Jim Wilson, <a href="http://jwilson.coe.uga.edu/emt725/Class/Lanier/Nine.Digit/nine.html">Statement of Nine-Digit Number puzzle</a> %Y A156071 Cf. A010784, A030299, A050289, A143671, A144688, A156069, A158242, A163574. %K A156071 nonn,base,fini,full %O A156071 1,1 %A A156071 _Alexander R. Povolotsky_, Sep 25 2009