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A072358 Number of cubefree numbers <= n which are not squarefree. 2
0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 4, 4, 5, 5, 5, 5, 5, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 9, 10, 10, 10, 10, 11, 12, 12, 13, 13, 13, 13, 13, 13, 13, 13, 14, 14, 14, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 17, 18, 18, 18, 18, 18, 18, 18, 18, 19 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

COMMENTS

a(n) = A060431(n) - A013928(n+1).

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = sum(A212793(k) * (1 - A008966(k)): k = 1..n). - Reinhard Zumkeller, May 27 2012

PROG

(Haskell)

a072358 n = a072358_list !! (n-1)

a072358_list = scanl1 (+) $

   zipWith (*) a212793_list $ map (1 -) a008966_list

-- Reinhard Zumkeller, May 27 2012

CROSSREFS

Cf. A067259, A004709, A005117.

Sequence in context: A238598 A156684 A070564 * A074795 A069577 A282426

Adjacent sequences:  A072355 A072356 A072357 * A072359 A072360 A072361

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Jul 18 2002

STATUS

approved

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Last modified August 21 18:38 EDT 2019. Contains 326168 sequences. (Running on oeis4.)