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 A374207 #8 Jul 01 2024 15:27:08 %S A374207 0,0,0,0,1,0,1,0,1,0,0,0,0,0,0,0,0,0,0,1,2,0,0,0,2,1,1,0,0,0,0,0,0,2, %T A374207 1,0,1,0,0,0,0,0,0,2,0,0,1,0,0,1,0,0,0,0,0,0,1,0,2,0,0,0,1,0,0,0,1,1, %U A374207 0,0,0,0,3,1,0,1,0,0,2,0,0,0,0,2,1,0,0,0,0,1,1,1,0,0,0,0,3,1,1,0,0,0,0,0,1,0,0 %N A374207 The 3-adic valuation of A113177(n), where A113177 is fully additive with a(p) = Fibonacci(p). %H A374207 Antti Karttunen, <a href="/A374207/b374207.txt">Table of n, a(n) for n = 2..100000</a> %F A374207 a(n) = A007949(A113177(n)). %o A374207 (PARI) %o A374207 A113177(n) = if(n<=1, 0, my(f=factor(n)); sum(i=1, #f~, f[i, 2]*fibonacci(f[i,1]))); %o A374207 A374207(n) = valuation(A113177(n), 3); %Y A374207 Cf. A007949, A113177, A374051, A374052 (indices of nonzero terms). %Y A374207 Cf. also A374133, A374213, A374203, A374206, A374208. %K A374207 nonn %O A374207 2,21 %A A374207 _Antti Karttunen_, Jul 01 2024