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 A003219 M2405 #23 Jul 02 2025 16:01:54
%S A003219 1,3,5,7,9,20,42,108,110,132,198,209,222,266,288,312,378,400,468,512,
%T A003219 558,648,738,782,804,828,918,1032,1098,1122,1188,1212,1278,1300,1368,
%U A003219 1458,1526,1548,1638,1704,1728,1818,1974,2007,2022,2088,2112,2156,2178
%N A003219 Self numbers divisible by sum of their digits (or, self numbers which are also Harshad numbers).
%D A003219 D. R. Kaprekar, Puzzles of the Self-Numbers. 311 Devlali Camp, Devlali, India, 1959.
%D A003219 D. R. Kaprekar, The Mathematics of the New Self Numbers (Part V). 311 Devlali Camp, Devlali, India, 1967.
%D A003219 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H A003219 N. J. A. Sloane, <a href="/A003219/b003219.txt">Table of n, a(n) for n = 1..7045</a>
%t A003219 Select[list=Range[2178]; Complement[list,Table[n+Total[IntegerDigits[n]],{n,list}]], IntegerQ[#/Total[IntegerDigits[#]]] &] (* _Jayanta Basu_, May 05 2013 *)
%Y A003219 Cf. A003052, A005349.
%K A003219 nonn,base
%O A003219 1,2
%A A003219 _N. J. A. Sloane_
%E A003219 More terms from _James Sellers_, Jul 06 2000