OFFSET
1,4
FORMULA
a(p^k) = p^(k-1) for p prime and 1 <= k <= 2, else 0 if k >= 3. - Wesley Ivan Hurt, Jun 26 2024
MATHEMATICA
Table[n*DivisorSum[n, (MoebiusMu[n/#]^2)/# &, PrimeQ[#] &], {n, 100}]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Wesley Ivan Hurt, Feb 03 2024
STATUS
approved