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 A340378 #7 Jan 16 2021 06:39:11 %S A340378 1,0,1,1,2,0,0,2,3,1,1,1,1,1,0,3,2,2,2,2,2,0,1,2,1,0,1,2,2,1,1,4,1,1, %T A340378 3,3,1,1,3,3,2,1,0,1,2,2,1,3,1,0,2,1,2,0,2,3,2,1,3,2,2,0,2,5,0,2,2,2, %U A340378 1,2,3,4,4,0,3,2,0,2,2,4,3,1,1,2,3,1,0,2,3,1,4,3,3,0,1,4,1,0,1,1,2,1,0,2,3 %N A340378 Number of 1-digits in the ternary representation of A048673(n). %C A340378 Binary weight of A304759(n). %H A340378 Antti Karttunen, <a href="/A340378/b340378.txt">Table of n, a(n) for n = 1..16384</a> %H A340378 <a href="/index/Pri#prime_indices">Index entries for sequences computed from indices in prime factorization</a> %F A340378 a(n) = A062756(A048673(n)) = A000120(A304759(n)). %F A340378 a(n) = A286585(n) - 2*A340379(n). %o A340378 (PARI) A340378(n) = hammingweight(A304759(n)); %Y A340378 Cf. A000120, A048673, A062756, A286585, A304759, A340379. %Y A340378 Cf. A340376 (positions of zeros). %K A340378 nonn %O A340378 1,5 %A A340378 _Antti Karttunen_, Jan 15 2021