OFFSET
1,1
COMMENTS
No negative terms in range 1 .. 2^20.
Apparently, A030059 gives the positions of all zeros.
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..16384
FORMULA
PROG
(PARI)
up_to = 16384;
A001615(n) = if(1==n, n, my(f=factor(n)); prod(i=1, #f~, f[i, 1]^f[i, 2] + f[i, 1]^(f[i, 2]-1))); \\ After code in A001615
DirInverseCorrect(v) = { my(u=vector(#v)); u[1] = (1/v[1]); for(n=2, #v, u[n] = (-u[1]*sumdiv(n, d, if(d<n, v[n/d]*u[d], 0)))); (u) }; \\ Compute the Dirichlet inverse of the sequence given in input vector v.
v347092 = DirInverseCorrect(vector(up_to, n, A322577(n)));
A347092(n) = v347092[n];
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Aug 18 2021
STATUS
approved