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 A135496 #11 Sep 29 2024 11:58:16 %S A135496 0,12182427369,12182427396,12182427639,12182427693,12182427936, %T A135496 12182427963,12182432769,12182432796,12182436279,12182436927, %U A135496 12182439276,12182439627,12182462739,12182462793,12182463279 %N A135496 Numbers k with the property that for each single digit d of k, the decimal expansion of 3d is a substring of k. %H A135496 David Applegate, <a href="/A135496/b135496.txt">Table of n, a(n) for n = 1..300</a> %o A135496 (C++) // For C++ program see the Applegate link in A135463. %Y A135496 Cf. A135463, A134962. %K A135496 nonn,base %O A135496 1,2 %A A135496 _Zak Seidov_, Feb 08 2008 %E A135496 Corrected by _David Applegate_, Feb 10 2008