OFFSET
1,2
COMMENTS
If p is prime, a(p) = Sum_{d|p} d * Omega(d) = 1*0 + p*1 = p.
EXAMPLE
a(6) = Sum_{d|6} d * Omega(d) = 1*0 + 2*1 + 3*1 + 6*2 = 17.
MATHEMATICA
Table[Sum[k*PrimeOmega[k] (1 - Ceiling[n/k] + Floor[n/k]), {k, n}], {n, 100}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Wesley Ivan Hurt, May 19 2021
STATUS
approved