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 A157849 #19 Feb 22 2020 20:50:02 %S A157849 4,12,16,18,20,22,23,28,30,32,33,34,36,38,40,43,52,55,56,57,58,59,62, %T A157849 63,64,65,66,67,68,69,71,72,74,76,79,90,93,95,98,100,103,104,109,111, %U A157849 112,113,119,122,123,124,126,129,131,133,134,136,137,138,141,142,146,148,151,154,157,162,170 %N A157849 Numbers k such that are not harmonic means of divisors of harmonic (Ore) numbers (harmonic (Ore) numbers is A001599). %C A157849 a(n) non-occurring in A001600(m) = A001599(m)*tau(A001599(m))/sigma(A001599(m)) = A001599(m)*A000005(A001599(m))/A000203(A001599(m)). %H A157849 Robert G. Wilson v, <a href="/A157849/b157849.txt">Table of n, a(n) for n = 1..412</a> %H A157849 Takeshi Goto, <a href="http://www.ma.noda.tus.ac.jp/u/tg/files/uts.pdf">On Ore's harmonic numbers</a>, slides, Tokyo University of Science, Japan. %Y A157849 Cf. A001600, A001599, A000005, A000203. %K A157849 nonn %O A157849 1,1 %A A157849 _Jaroslav Krizek_, Mar 07 2009 %E A157849 More terms from _Robert G. Wilson v_, Aug 18 2013