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 A336557 #6 Jul 27 2020 21:09:39
%S A336557 1,2,3,4,5,6,7,8,9,11,12,13,14,15,16,17,18,19,20,23,24,25,26,27,28,29,
%T A336557 31,32,36,37,38,39,41,43,44,45,47,48,49,50,51,53,54,56,59,60,61,62,63,
%U A336557 64,67,68,71,72,73,74,75,76,78,79,80,81,83,86,87,89,92,95,96,97,99,100,101,103,104,107,108,109,111,112
%N A336557 Numbers k such that A336456(n) = Product_{p^e|n} A336456(p^e). Here each p^e is the maximal power of prime p that divides k, and A336456(n) = A335915(sigma(sigma(n))).
%C A336557 Numbers at which points A336456 appears to be multiplicative.
%H A336557 Antti Karttunen, <a href="/A336557/b336557.txt">Table of n, a(n) for n = 1..10000</a>
%Y A336557 Cf. A335915, A336456.
%Y A336557 Cf. A336556 (characteristic function), A336558 (complement).
%Y A336557 Union of A000961 and A336559.
%Y A336557 Union of A336547 and A336560.
%K A336557 nonn
%O A336557 1,2
%A A336557 _Antti Karttunen_, Jul 25 2020