A072731 - OEIS

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A072731

Difference of numbers of composite and prime numbers <= n.

0, -1, -2, -1, -2, -1, -2, -1, 0, 1, 0, 1, 0, 1, 2, 3, 2, 3, 2, 3, 4, 5, 4, 5, 6, 7, 8, 9, 8, 9, 8, 9, 10, 11, 12, 13, 12, 13, 14, 15, 14, 15, 14, 15, 16, 17, 16, 17, 18, 19, 20, 21, 20, 21, 22, 23, 24, 25, 24, 25, 24, 25, 26, 27, 28, 29, 28, 29, 30, 31, 30, 31, 30, 31, 32, 33, 34 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,3`
	COMMENTS	`a(n+1) = a(n) + A066247(n) - A010051(n), a(1) = 0;` `a(n) < 0 iff 1<n<=8.`
	FORMULA	`a(n) = A065855(n) - A000720(n).`
	CROSSREFS	`Cf. A002808, A000040.` `Sequence in context: A107393 A197366 A047885 * A129174 A129175 A063053` `Adjacent sequences: A072728 A072729 A072730 * A072732 A072733 A072734`
	KEYWORD	`sign`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Aug 08 2002`

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Last modified February 14 05:41 EST 2012. Contains 205570 sequences.