id:A081304 - OEIS Search Results

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Number of numbers m <= n with prime factors less than 2*spf(m), where spf(m) is the smallest prime factor of m (A020639).

+0
3

1, 2, 3, 4, 5, 6, 7, 8, 9, 9, 10, 11, 12, 12, 13, 14, 15, 16, 17, 17, 17, 17, 18, 19, 20, 20, 21, 21, 22, 22, 23, 24, 24, 24, 25, 26, 27, 27, 27, 27, 28, 28, 29, 29, 30, 30, 31, 32, 33, 33, 33, 33, 34, 35, 35, 35, 35, 35, 36, 36, 37, 37, 37, 38, 38, 38, 39, 39, 39, 39, 40, 41, 42 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(n)+A081305(n)=n; a(114)=A081305(114)=57;` `a(n)>=n/2 for n<=114, a(n)<n/2 for n>114.`
	CROSSREFS	`Cf. A081306, A081303.` `Sequence in context: A128635 A100637 A081063 this_sequence A137721 A028904 A081600` `Adjacent sequences: A081301 A081302 A081303 this_sequence A081305 A081306 A081307`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 17 2003`

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Last modified September 6 16:04 EDT 2008. Contains 143483 sequences.

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