OFFSET
1,2
COMMENTS
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
Zhu Weiyi, On the cube free number sequences, Smarandache Notions J., Vol. 14 (2004), pp. 199-202.
FORMULA
a(n) = Sum_{k=1..n} A004709(k).
a(n) = (zeta(3)/2)*n^2 + O(n^(3/2+eps)) (Weiyi, 2004).
MATHEMATICA
Accumulate[Select[Range[100], Max[FactorInteger[#][[;; , 2]]] < 3 &]]
CROSSREFS
KEYWORD
nonn
AUTHOR
Amiram Eldar, Oct 29 2022
EXTENSIONS
Corrected by Amiram Eldar, Jan 02 2024
STATUS
approved