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 A232489 #20 Jun 20 2025 10:45:13 %S A232489 5,86,977,9968,99959,9999950,99999941,999999932,9999999923, %T A232489 99999999914,999999999896,999999999905,9999999999887,99999999999878, %U A232489 999999999999869,99999999999999860,999999999999999851,9999999999999999842,99999999999999999833,999999999999999999824,9999999999999999999815,99999999999999999999797 %N A232489 Numbers k such that k + (sum of digits of k) is a power of 10. %D A232489 M. Gardner, Time Travel and Other Mathematical Bewilderments. Freeman, NY, 1988, pp. 115-117 and 122. %D A232489 D. R. Kaprekar, Puzzles of the Self-Numbers. 311 Devlali Camp, Devlali, India, 1959. %D A232489 D. R. Kaprekar, The Mathematics of the New Self Numbers (Part V). 311 Devlali Camp, Devlali, India, 1967. %H A232489 Donovan Johnson, <a href="/A232489/b232489.txt">Table of n, a(n) for n = 1..997</a> %H A232489 T. Trotter, <a href="http://www.trottermath.net/numthry/charlene.html">Charlene Numbers</a> %H A232489 <a href="/index/Coi#Colombian">Index entries for Colombian or self numbers and related sequences</a> %Y A232489 Cf. A062028, A232490, A232491. %K A232489 nonn,base %O A232489 1,1 %A A232489 _N. J. A. Sloane_, Dec 01 2013 %E A232489 Terms a(6) onward from _Max Alekseyev_, Dec 02 2013