OFFSET
1,1
FORMULA
Sum_{n>=1} a(n) * x^n / (1 - x^n) = Sum_{n>=1} prime(n+1) * x^n.
a(n) = Sum_{d|n} mu(n/d)* prime(d+1).
MATHEMATICA
Table[DivisorSum[n, MoebiusMu[n/#] Prime[# + 1] &], {n, 1, 60}]
PROG
(PARI) a(n) = sumdiv(n, d, moebius(n/d)* prime(d+1)); \\ Michel Marcus, Apr 27 2022
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Apr 26 2022
STATUS
approved