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 A112819 #16 Jan 01 2024 11:56:03
%S A112819 20,24,529,530,531,532,533,534,535,536,537,538,539,540,541,542,543,
%T A112819 544,545,546,547,548,549,550,551,552,553,554,555,556,557,558,41889597,
%U A112819 41889598,41889599,41889600,41889601,41889602,41889603,41889604,41889605,41889606,41889607
%N A112819 Numbers k such that lcm(1,2,3,...,k)/15 equals the denominator of the k-th harmonic number H(k).
%C A112819 When 15 occurs in A110566.
%H A112819 Chai Wah Wu, <a href="/A112819/b112819.txt">Table of n, a(n) for n = 1..10000</a>
%t A112819 a = h = 1; t = {}; Do[a = LCM[a, n]; h = h + 1/n; If[a/Denominator[h] == 15, AppendTo[t, n]], {n, 10^6}]; t
%Y A112819 Cf. A002805, A003418, A110566.
%Y A112819 Cf. A098464, A112813, A112814, A112815, A112816, A112817, A112818, A112820, A112821, A112822.
%K A112819 nonn
%O A112819 1,1
%A A112819 _Robert G. Wilson v_, Sep 17 2005
%E A112819 Definition corrected by _Jinyuan Wang_, May 03 2020
%E A112819 More terms from _Chai Wah Wu_, Mar 18 2021