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 A158240 #9 Dec 23 2015 02:34:46 %S A158240 1,10,102,3452,24365,123654,7836542,38165472,381654720,3816547290 %N A158240 Smallest number made up of n consecutive digits such that every k-digit substring (k <= n) taken from the left is divisible by k (k=1..n). %e A158240 123654, for instance, is in the sequence because 1|1, 2|12, 3|123, 4|1236, 5|12365, 6|123654. %Y A158240 Cf. A158242. %K A158240 nonn,base,fini,full %O A158240 1,2 %A A158240 _Lekraj Beedassy_, Mar 14 2009 %E A158240 a(4), a(5), a(7), a(9) corrected by _Ray Chandler_, Mar 21 2009