OFFSET
1,2
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..167
FORMULA
a(prime(n)) = A104128(n). - Michel Marcus, Jun 29 2021
EXAMPLE
a(4) = Sum_{d|4} 4^sigma(d) = 4^1 + 4^3 + 4^7 = 16452.
MATHEMATICA
a[n_] := DivisorSum[n, n^DivisorSigma[1, #] &]; Array[a, 16] (* Amiram Eldar, Jun 29 2021 *)
PROG
(PARI) a(n) = sumdiv(n, d, n^sigma(d)); \\ Michel Marcus, Jun 29 2021
CROSSREFS
KEYWORD
nonn
AUTHOR
Wesley Ivan Hurt, Jun 28 2021
STATUS
approved