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 A353561 #11 May 20 2022 06:33:32
%S A353561 2,4,6,12,20,30,60,84,168,336,528,880,1320,2640,5280,10560,12480,
%T A353561 24960,49920,74880,104832,209664,419328,838656,1096704,2193408,
%U A353561 4386816,8773632,14622720,29245440,58490880,116981760,233963520,350945280,701890560,784465920,1568931840,2465464320,4930928640,9861857280,14792785920
%N A353561 Prime shadows of colossally abundant numbers, A004490.
%C A353561 Sequence is injective (no duplicate values occur) because A004490 is a subsequence of A025487.
%H A353561 Amiram Eldar, <a href="/A353561/b353561.txt">Table of n, a(n) for n = 1..3367</a>
%F A353561 a(n) = A181819(A004490(n)).
%F A353561 a(n) = A122111(A342012(n)).
%o A353561 (PARI)
%o A353561 v004490 = readvec("b004490_to.txt"); \\ Prepared from b-file of A004490 with gawk ' { print $2 } '
%o A353561 A004490(n) = v004490[n];
%o A353561 A181819(n) = factorback(apply(e->prime(e),(factor(n)[,2])));
%o A353561 A353561(n) = A181819(A004490(n));
%Y A353561 Cf. A004490, A025487, A122111, A181819, A342012.
%Y A353561 Cf. also A353562, A353568.
%K A353561 nonn
%O A353561 1,1
%A A353561 _Antti Karttunen_, Apr 29 2022