id:A073445 - OEIS Search Results

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Second differences of A002808, the sequence of composites.

+0
1

0, -1, 0, 1, 0, -1, 0, 1, 0, -1, 0, 1, -1, 0, 0, 0, 1, 0, -1, 0, 0, 0, 1, -1, 0, 1, 0, -1, 0, 1, -1, 0, 0, 0, 1, -1, 0, 0, 0, 1, 0, -1, 0, 0, 0, 1, -1, 0, 1, 0, -1, 0, 0, 0, 1, -1, 0, 1, -1, 0, 0, 0, 1, -1, 0, 0, 0, 0, 0, 1, -1, 0, 1, 0, -1, 0, 1, 0, -1, 0, 1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, -1, 0, 1, -1, 0, 0, 0, 1, 0, -1, 0, 0, 0, 0, 0, 0, 0, 1, 0, -1, 0 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`a(n)=c[n+2]-2c[n+1])+c[n], where c(n)=A002808(n).`
	MATHEMATICA	`c[x_] := FixedPoint[x+PrimePi[ # ]+1&, x] Table[(c[w+2]-2*c[w+1])+c[w]), {w, 1, 1000}]`
	CROSSREFS	`Also first differences of A054546.` `Cf. A002808, A054546.` `Sequence in context: A134452 A071029 A071030 this_sequence A113217 A147781 A082446` `Adjacent sequences: A073442 A073443 A073444 this_sequence A073446 A073447 A073448`
	KEYWORD	`sign`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Aug 01 2002`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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