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 A235228 #15 Sep 08 2022 08:46:06
%S A235228 99,189,198,279,288,297,369,378,387,396,459,468,477,486,495,549,558,
%T A235228 567,576,585,594,639,648,657,666,675,684,693,729,738,747,756,765,774,
%U A235228 783,792,819,828,837,846,855,864,873,882,891,909,918,927,936,945,954,963
%N A235228 Numbers whose sum of digits is 18.
%C A235228 A007953(a(n)) = 18; number of repdigits = #{99,666,333333,222222222,1^18} = A242627(18) = 5. - _Reinhard Zumkeller_, Jul 17 2014
%H A235228 Vincenzo Librandi, <a href="/A235228/b235228.txt">Table of n, a(n) for n = 1..1000</a>
%F A235228 a(n) = 9*A279769(n). - _M. F. Hasler_, Dec 23 2016
%t A235228 Select[Range[1000], Total[IntegerDigits[#]] == 18 &]
%o A235228 (Magma) [n: n in [1..1000] | &+Intseq(n) eq 18];
%o A235228 (Haskell)
%o A235228 a235228 n = a235228_list !! (n-1)
%o A235228 a235228_list = filter ((== 18) . a007953) [0..]
%o A235228 -- _Reinhard Zumkeller_, Jul 17 2014
%Y A235228 Cf. A052217 - A052224, A061423, A143164, A166311, A166370, A166459.
%Y A235228 Cf. A011557 (1), A052216 (2), A052217 (3), A052218 (4), A052219 (5), A052220 (6), A052221 (7), A052222 (8), A052223 (9), A052224 (10), A166311 (11), A235151 (12), A143164 (13), A235225(14), A235226 (15), A235227 (16), A166370 (17), A166459 (19), A235229 (20).
%Y A235228 Cf. A242614, A242627.
%K A235228 nonn,base,easy
%O A235228 1,1
%A A235228 _Vincenzo Librandi_, Jan 05 2014