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 A112816 #16 Jan 31 2021 02:38:14 %S A112816 63,64,65,69,70,71,189,190,191,192,193,194,195,196,197,207,208,209, %T A112816 210,211,212,213,214,215,1701,1702,1703,1704,1705,1706,1707,1708,1709, %U A112816 1710,1711,1712,1713,1714,1715,1716,1717,1718,1719,1720,1721,1722,1723,1724 %N A112816 Numbers k such that lcm(1,2,3,...,k)/9 equals the denominator of the k-th harmonic number H(k). %C A112816 When 9 occurs in A110566. %H A112816 Amiram Eldar, <a href="/A112816/b112816.txt">Table of n, a(n) for n = 1..10000</a> (terms 1..1483 from Jinyuan Wang) %t A112816 f[n_] := LCM @@ Range[n]/Denominator[ HarmonicNumber[n]]; Select[ Range[1724], f[ # ] == 9 &] %Y A112816 Cf. A002805, A003418, A110566. %Y A112816 Cf. A098464, A112813, A112814, A112815, A112817, A112818, A112819, A112820, A112821, A112822. %K A112816 nonn %O A112816 1,1 %A A112816 _Robert G. Wilson v_, Sep 17 2005 %E A112816 Definition corrected by _Jinyuan Wang_, May 03 2020