OFFSET
1,6
FORMULA
a(n) = A085970(n) + 1.
EXAMPLE
The a(30) = 14 numbers: 1, 6, 10, 12, 14, 15, 18, 20, 21, 22, 24, 26, 28, 30.
MATHEMATICA
Table[Length[Select[Range[n], !PrimePowerQ[#]&]], {n, 100}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Gus Wiseman, Jul 31 2022
STATUS
approved