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 A075018 #7 Aug 20 2024 14:43:22
%S A075018 3,3,3,5,3,3,5,5,6,3,18,9,11,5,3,15,13,15,19,23,18,29,29,15,28,11,33,
%T A075018 5,4,3,40,15,18,13,18,15,28,19,24,23,26,39,7,51,33,29,55,15,53,53,30,
%U A075018 63,54,33,18,5,57,41,56,63,69,71,60,15,63
%N A075018 Smallest k such that the concatenation k, k-1,k-2,k-3 is divisible by n; or 0 if no such number exists.
%e A075018 a(7) = 5 as 7 divides 5432.
%t A075018 Transpose[Flatten[Table[Select[Reverse[Partition[Range[100,0,-1], 4,1]], Divisible[FromDigits[ Flatten[IntegerDigits/@#]],n]&,1],{n,70}],1]] [[1]] (* _Harvey P. Dale_, Nov 22 2011 *)
%Y A075018 Cf. A075113, A075114, A075115, A075116, A075117.
%K A075018 base,nonn
%O A075018 1,1
%A A075018 _Amarnath Murthy_, Sep 01 2002
%E A075018 Corrected and extended by Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 19 2003