OFFSET
0,4
COMMENTS
The number of integers not exceeding 2^n that are not squarefree.
LINKS
Amiram Eldar, Table of n, a(n) for n = 0..64 (calculated from the b-file at A143658)
MATHEMATICA
c = 0; k = 1; lst = {}; Do[ While[k <= 2^n, If[ !SquareFreeQ@ k, c++ ]; k++ ]; AppendTo[lst, c], {n, 0, 26}]; lst
CROSSREFS
KEYWORD
nonn
AUTHOR
Robert G. Wilson v, Aug 31 2008
EXTENSIONS
a(0) inserted and more terms added by Amiram Eldar, Feb 09 2021
STATUS
approved