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 A347239 Sum of A347236 and its Dirichlet inverse. 3
 2, 0, 0, 1, 0, 4, 0, 13, 4, 4, 0, 26, 0, 8, 8, 55, 0, 34, 0, 26, 16, 4, 0, 26, 4, 8, 68, 52, 0, 0, 0, 133, 8, 4, 16, 223, 0, 8, 16, 26, 0, 0, 0, 26, 68, 12, 0, 110, 16, 74, 8, 52, 0, 68, 8, 52, 16, 4, 0, 4, 0, 12, 136, 463, 16, 0, 0, 26, 24, 0, 0, 247, 0, 8, 148, 52, 16, 0, 0, 110, 421, 4, 0, 8, 8, 8, 8, 26, 0, 8, 32 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS It seems that A030059 gives the positions of all zeros. LINKS Antti Karttunen, Table of n, a(n) for n = 1..20000 FORMULA a(n) = A347236(n) + A347238(n). a(1) = 2, and for n >1, a(n) = -Sum_{d|n, 1= 1, a(A030059(n)) = 0 and a(A030229(n)) = 2*A347236(A030229(n)). For all n >= 1, a(A001248(n)) = A000290(A001223(n)). PROG (PARI) up_to = 16384; DirInverseCorrect(v) = { my(u=vector(#v)); u[1] = (1/v[1]); for(n=2, #v, u[n] = (-u[1]*sumdiv(n, d, if(d

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Last modified January 18 17:18 EST 2022. Contains 350455 sequences. (Running on oeis4.)