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 A078243 #12 Dec 05 2013 19:55:57
%S A078243 4,4,444,4,40,444,4004,40,444444444,40,44,444,4004,4004,4440,400,
%T A078243 44404,444444444,44004,40,40404,44,440404,4440,400,4004,4404444444,
%U A078243 4004,4404404,4440,444044,4000,444444,44404,40040,444444444,444,44004,40404
%N A078243 Smallest multiple of n using only digits 0 and 4.
%C A078243 a(n) = min{A169967(k): k > 1 and A169967(k) mod n = 0}. [_Reinhard Zumkeller_, Jan 10 2012]
%H A078243 Reinhard Zumkeller, <a href="/A078243/b078243.txt">Table of n, a(n) for n = 1..998</a>
%o A078243 (Haskell)
%o A078243 a078243 n = head [x | x <- tail a169967_list, mod x n == 0]
%o A078243 -- _Reinhard Zumkeller_, Jan 10 2012
%Y A078243 Cf. A004290, A078241-A078248, A079339, A096681-A096688.
%K A078243 base,nonn
%O A078243 1,1
%A A078243 _Amarnath Murthy_, Nov 23 2002
%E A078243 More terms from _Ray Chandler_, Jul 12 2004