OFFSET
1,4
COMMENTS
Zeros occur at n = 352, 26840, 34816, 3787168, ...
LINKS
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<n, v[n/d]*u[d], 0)))); (u) }; \\ Compute the Dirichlet inverse of the sequence given in input vector v.
A003961(n) = { my(f=factor(n)); for (i=1, #f~, f[i, 1] = nextprime(f[i, 1]+1)); factorback(f); }; \\ From A003961
v346248 = DirInverseCorrect(vector(up_to, n, (n+n)-A003961(n)));
A346248(n) = v346248[n];
CROSSREFS
KEYWORD
sign,look
AUTHOR
Antti Karttunen, Jul 19 2021
STATUS
approved