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 A235229 #9 Sep 08 2022 08:46:06
%S A235229 299,389,398,479,488,497,569,578,587,596,659,668,677,686,695,749,758,
%T A235229 767,776,785,794,839,848,857,866,875,884,893,929,938,947,956,965,974,
%U A235229 983,992,1199,1289,1298,1379,1388,1397,1469,1478,1487,1496,1559,1568,1577,1586
%N A235229 Numbers whose sum of digits is 20.
%C A235229 A007953(a(n)) = 20; number of repdigits = #{5555,44444,2222222222,1^20} = A242627(20) = 4. - _Reinhard Zumkeller_, Jul 17 2014
%H A235229 Vincenzo Librandi, <a href="/A235229/b235229.txt">Table of n, a(n) for n = 1..1000</a>
%t A235229 Select[Range[2000], Total[IntegerDigits[#]]==20&]
%o A235229 (Magma) [n: n in [1..2000] | &+Intseq(n) eq 20];
%o A235229 (Haskell)
%o A235229 a235229 n = a235229_list !! (n-1)
%o A235229 a235229_list = filter ((== 20) . a007953) [0..]
%o A235229 -- _Reinhard Zumkeller_, Jul 17 2014
%Y A235229 Cf. A052217 - A052224, A143164, A166311, A166370, A166459.
%Y A235229 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), A235228 (18), A166459 (19).
%Y A235229 Cf. A242614, A242627.
%K A235229 base,nonn
%O A235229 1,1
%A A235229 _Vincenzo Librandi_, Jan 05 2014