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 A069035 #40 Feb 15 2021 23:00:56
%S A069035 10,20,12,40,50,24,70,80,18,190,209,48,247,266,195,448,476,198,874,
%T A069035 3980,399,2398,1679,888,4975,1898,999,7588,4988,39990,8959,17888,
%U A069035 42999,28798,57995,29988,37999,59888,49998,699880,177899,88998,99889,479996
%N A069035 Smallest proper multiple of n with digit sum n.
%H A069035 David A. Corneth, <a href="/A069035/b069035.txt">Table of n, a(n) for n = 1..274</a>
%t A069035 ssm[n_]:=Module[{k=2},While[Total[IntegerDigits[k*n]]!=n,k++];k*n]; Array[ ssm,50] (* _Harvey P. Dale_, Nov 24 2012 *)
%o A069035 (PARI) a(n) = {my(m=2*n); while (sumdigits(m) != n, m+=n); m;} \\ _Michel Marcus_, Feb 24 2016
%Y A069035 Cf. A002998, A007953.
%K A069035 nonn,base
%O A069035 1,1
%A A069035 _Amarnath Murthy_, Apr 02 2002
%E A069035 Offset corrected by _Harvey P. Dale_, Nov 24 2012