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 A378443 #8 Nov 27 2024 17:56:10
%S A378443 1,1,1,1,2,2,2,2,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,3,3,2,2,2,2,4,2,2,2,2,
%T A378443 4,3,2,2,2,4,2,4,2,2,2,2,2,4,3,3,2,2,2,3,4,4,2,2,2,4,2,2,2,3,4,4,2,2,
%U A378443 2,4,2,4,2,2,3,2,4,4,2,4,2,2,2,4,4,2,2,4,2,4,4,2,2,2,4,4,2,3,2,3,2,4,2,4,4
%N A378443 Inverse Möbius transform of A372573.
%C A378443 Number of terms of A339746 that divide n.
%H A378443 Antti Karttunen, <a href="/A378443/b378443.txt">Table of n, a(n) for n = 1..20000</a>
%F A378443 a(n) = Sum_{d|n} A372573(d).
%o A378443 (PARI)
%o A378443 A372573(n) = !((valuation(n, 2)-valuation(n, 3))%3);
%o A378443 A378443(n) = sumdiv(n,d,A372573(d));
%Y A378443 Cf. A339746, A372573.
%Y A378443 Cf. also A174273, A378444.
%K A378443 nonn
%O A378443 1,5
%A A378443 _Antti Karttunen_, Nov 27 2024