OFFSET
1,6
COMMENTS
Number of pairs (p,q) with 1 < p < q <= n, p|q and p prime. - Wesley Ivan Hurt, Oct 30 2022
MATHEMATICA
Accumulate[Array[If[PrimeQ[#], 0, PrimeNu[#]]&, 110]] (* Harvey P. Dale, Jul 19 2019 *)
PROG
(PARI) a(n) = sum(k=1, n, if (!isprime(k), omega(k))); \\ Michel Marcus, Nov 06 2022
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Dec 11 2008
STATUS
approved