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 A340582 #27 Jan 21 2021 10:45:54 %S A340582 25908120,136616760,171430560,196876680,354049920,405601560,514374840, %T A340582 825473880,1204476000,2223650520,2510539920,3003191100,4017339480, %U A340582 4574146500,6129062940,6797728800,7311296520,9779952000,12472435080,13103164800,19989450000,22180840920,22710872520 %N A340582 Numbers k such that sigma(k) = 4 * sigma(k+1). %H A340582 Seiichi Manyama, <a href="/A340582/b340582.txt">Table of n, a(n) for n = 1..30</a> (using A058073 data) %Y A340582 Cf. A002961, A080372, A163193, A217791, A340713, A340720. %K A340582 nonn %O A340582 1,1 %A A340582 _Seiichi Manyama_, Jan 21 2021 %E A340582 a(9)-a(23) from _Seiichi Manyama_ using A058073 data, Jan 21 2021