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