OFFSET
1,2
FORMULA
a(p^k) = p^k, for p prime and 1 <= k <= 2, else 1 if k >= 3. - Wesley Ivan Hurt, Jun 26 2024
MATHEMATICA
Table[DivisorSum[n, n^(MoebiusMu[n/#]^2) &, PrimeQ[#] &], {n, 100}]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Wesley Ivan Hurt, Feb 03 2024
STATUS
approved