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 A077494 #7 Apr 07 2014 16:27:18
%S A077494 143,3,16,2,6,1,5,9,4,8,12,7,11,24,28,14,27,67,71,57,97,128,114,127,
%T A077494 257,414,427,557,714,997,857,1257,1414,1427,4257,2857,5714,8427,8557,
%U A077494 9857,11427,14257,12857,28557,55714,42857,71427,85714,99857,112857,128557
%N A077494 a(n) = smallest k such that the digit sum of 7k is n.
%F A077494 A077493(n)/7
%t A077494 sk7[n_]:=Module[{k=1},While[Total[IntegerDigits[7k]]!=n,k++];k]; Array[ sk7,60,2] (* _Harvey P. Dale_, Apr 07 2014 *)
%Y A077494 Cf. A069532, A069534, A077493.
%K A077494 base,nonn
%O A077494 2,1
%A A077494 _Amarnath Murthy_, Nov 07 2002
%E A077494 Corrected and extended by _Ray Chandler_, Aug 03 2003