OFFSET
1,2
COMMENTS
Logarithmic derivative of A179304.
MATHEMATICA
a[n_] := DivisorSum[n, Binomial[n, #] * DivisorSigma[1, #] &]; Array[a, 35] (* Amiram Eldar, Aug 18 2023 *)
PROG
(PARI) a(n)=sumdiv(n, d, sigma(d)*binomial(n, d))
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Jul 10 2010
STATUS
approved