OFFSET
1,1
COMMENTS
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
Eckford Cohen, Arithmetical notes, IX. On the set of integers representable as a product of a prime and square, Acta Arithmetica, Vol. 7 (1962), pp. 417-420.
FORMULA
The number of terms not exceeding x is (Pi^2/6) * x/log(x) + O(x/(log(x))^2) (Cohen, 1962).
MATHEMATICA
Select[Range[2, 200], Select[FactorInteger[#][[;; , 2]], OddQ] == {1} &]
CROSSREFS
KEYWORD
nonn
AUTHOR
Amiram Eldar, Jul 27 2020
STATUS
approved