OFFSET
1,4
FORMULA
a(p^k) = 1 for p prime and k = 1, else p^k if k >= 2. - Wesley Ivan Hurt, Jun 26 2024
MATHEMATICA
Table[DivisorSum[n, n^PrimeNu[n/#] &, PrimeQ[#] &], {n, 100}]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Wesley Ivan Hurt, Feb 05 2024
STATUS
approved