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 A078240 #6 Sep 17 2024 19:36:29
%S A078240 4,4,6,4,40,6,49,8,9,40,44,48,468,84,60,48,68,90,494,40,84,44,46,48,
%T A078240 400,468,486,84,406,60,496,64,66,68,490,468,444,494,468,40,984,84,86,
%U A078240 44,90,46,94,48,49,400,408,468,689,486,440,448,684,406,649,60
%N A078240 a(n) = smallest multiple of n using only composite digits (0,4,6,8,9).
%H A078240 Andrew Howroyd, <a href="/A078240/b078240.txt">Table of n, a(n) for n = 1..10000</a>
%o A078240 (PARI) a(n)={my(S=Set([1,2,3,5,7])); forstep(m=n, oo, n, my(d=digits(m)); if(#select(t->setsearch(S,t), d)==0, return(m)))} \\ _Andrew Howroyd_, Sep 17 2024
%Y A078240 Cf. A001744, A078239, A078250.
%K A078240 base,easy,nonn
%O A078240 1,1
%A A078240 _Amarnath Murthy_, Nov 23 2002
%E A078240 Corrected and extended by _Andrew Howroyd_, Sep 17 2024