OFFSET
1,2
COMMENTS
FORMULA
a(n) = Sum{k=1..n} A100959(k).
EXAMPLE
a(5) = 18 = 1 + 2 + 3 + 5 + 7.
MATHEMATICA
Accumulate[Select[Range[100], PrimeOmega[#]!=2&]] (* Harvey P. Dale, Aug 22 2021 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Jonathan Vos Post, May 13 2008
EXTENSIONS
Corrected and edited by Giovanni Resta, Jun 20 2016
STATUS
approved