id:A063084 - OEIS Search Results

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a(n) = Pi[n-1]*n-Pi[n]*(n-1), where Pi[] = A000720().

+0
1

0, -1, -1, 2, -2, 3, -3, 4, 4, 4, -6, 5, -7, 6, 6, 6, -10, 7, -11, 8, 8, 8, -14, 9, 9, 9, 9, 9, -19, 10, -20, 11, 11, 11, 11, 11, -25, 12, 12, 12, -28, 13, -29, 14, 14, 14, -32, 15, 15, 15, 15, 15, -37, 16, 16, 16, 16, 16, -42, 17, -43, 18, 18, 18, 18, 18, -48, 19, 19, 19, -51, 20, -52, 21, 21, 21, 21, 21, -57, 22, 22, 22, -60, 23, 23 (list; graph; listen)

	OFFSET	`1,4`
	REFERENCES	`G. A. Kudrevatow, (1970): Exercises in Number Theory. Problem 488; page 56; Prosveshenie, Moscow [in Russian].`
	EXAMPLE	`The function is positive for composite and negative for prime numbers. It is zero at n=1.`
	CROSSREFS	`Cf. A000720, A000027, A010051, A061397, A000040, A002808.` `Sequence in context: A132924 A076890 A103358 this_sequence A127079 A080251 A137791` `Adjacent sequences: A063081 A063082 A063083 this_sequence A063085 A063086 A063087`
	KEYWORD	`sign`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Aug 06 2001`

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Last modified September 5 01:39 EDT 2008. Contains 143414 sequences.

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