id:A078442 - OEIS Search Results

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a(p(n))=a(n)+1 for n-th prime p(n); a(n)=0 if n is not prime.

+0
4

0, 1, 2, 0, 3, 0, 1, 0, 0, 0, 4, 0, 1, 0, 0, 0, 2, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 5, 0, 0, 0, 0, 0, 1, 0, 0, 0, 2, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 3, 0, 1, 0, 0, 0, 0, 0, 2, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`Fernandez calls this the order of primeness of n.`
	LINKS	`N. Fernandez, An order of primeness, F(p)`
	EXAMPLE	`a(1)=0 since 1 is not prime; a(2)=a(p(1))=a(1)+1=1+0=1; a(3)=a(p(2))=a(2)+1=1+1=2; a(4)=0 since 4 is not prime; a(5)=a(p(3))=a(3)+1=2+1=3; a(6)=0 since 6 is not prime; a(7)=a(p(4))=a(4)+1=0+1=1.`
	CROSSREFS	`a(A000040(n))=A049076(n), a(A018252(n))=0.` `Sequence in context: A113303 A080089 A113290 this_sequence A135523 A135685 A164658` `Adjacent sequences: A078439 A078440 A078441 this_sequence A078443 A078444 A078445`
	KEYWORD	`nonn`
	AUTHOR	`Henry Bottomley (se16(AT)btinternet.com), Dec 31 2002`

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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.

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