id:A081063 - OEIS Search Results

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Number of numbers <= n that are 3-smooth or prime powers.

+0
2

1, 2, 3, 4, 5, 6, 7, 8, 9, 9, 10, 11, 12, 12, 12, 13, 14, 15, 16, 16, 16, 16, 17, 18, 19, 19, 20, 20, 21, 21, 22, 23, 23, 23, 23, 24, 25, 25, 25, 25, 26, 26, 27, 27, 27, 27, 28, 29, 30, 30, 30, 30, 31, 32, 32, 32, 32, 32, 33, 33, 34, 34, 34, 35, 35, 35, 36, 36, 36, 36, 37, 38, 39 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(n) = #{A081061(k): 1<=k<=n}.`
	FORMULA	`a(n)=A071521(n)+A065515(n)-A000523(n)-A062153(n)+1.`
	CROSSREFS	`Cf. A003586, A000961.` `Sequence in context: A137180 A128635 A100637 this_sequence A081304 A137721 A028904` `Adjacent sequences: A081060 A081061 A081062 this_sequence A081064 A081065 A081066`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 04 2003`

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Last modified December 10 12:09 EST 2009. Contains 170569 sequences.

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