id:A120444 - OEIS Search Results

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A120444

First differences of A004125.

+0
1

0, 1, 0, 3, -1, 5, 0, 4, 1, 9, -5, 11, 3, 5, 0, 15, -4, 17, -3, 9, 7, 21, -13, 18, 9, 13, -1, 27, -13, 29, 0, 17, 13, 21, -20, 35, 15, 21, -11, 39, -13, 41, 3, 11, 19, 45, -29, 40, 6, 29, 5, 51, -13, 37, -9, 33, 25, 57, -49, 59, 27, 21, 0, 45, -13, 65, 9, 41, -5, 69, -52, 71, 33, 25, 11, 57, -13, 77, -27, 40, 37, 81, -57, 61, 39, 53, -5 (list; graph; listen)

	OFFSET	`1,4`
	COMMENT	`It appears that (1) a(n)=0 if and only if n is a power of 2 and (2) a(n)=n-1 if and only if n+1 is a prime. (This has been verified for the first 2000 terms.`
	CROSSREFS	`Sequence in context: A112668 A016734 A125846 this_sequence A094919 A010286 A002945` `Adjacent sequences: A120441 A120442 A120443 this_sequence A120445 A120446 A120447`
	KEYWORD	`sign`
	AUTHOR	`John W. Layman (layman(AT)math.vt.edu), Jul 19 2006`

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.

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