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 A342350 #11 Apr 08 2021 07:19:08 %S A342350 38272753,38272754,38272755,38272756,38272757,38272758,38272759, %T A342350 38272760,38272761,38272762,38272763,38272764,38272765,38272766, %U A342350 38272767,38272768,38272769,38272770,38272771,38272772,38272773,38272774,38272775,38272776,38272777,38272778 %N A342350 Numbers k such that lcm(1,2,3,...,k)/21 equals the denominator of the k-th harmonic number H(k). %C A342350 Positions where 21 occurs in A110566. %H A342350 Chai Wah Wu, <a href="/A342350/b342350.txt">Table of n, a(n) for n = 1..10000</a> %H A342350 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/NonRecursions.html">Non Recursions</a> %Y A342350 Cf. A002805, A003418, A110566. %Y A342350 Cf. A098464, A112813, A112814, A112815, A112816, A112817, A112818, A112819, A112820, A112821, A112822. %K A342350 nonn %O A342350 1,1 %A A342350 _Chai Wah Wu_, Mar 17 2021