id:A076608 - OEIS Search Results

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Number of nonprimes k < n such that also n-k is not a prime.

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0, 1, 0, 0, 2, 0, 2, 1, 2, 4, 2, 3, 4, 4, 4, 7, 4, 7, 6, 7, 6, 10, 6, 11, 8, 12, 8, 13, 10, 15, 12, 13, 12, 18, 12, 21, 14, 16, 16, 21, 16, 23, 18, 21, 18, 24, 18, 27, 20, 27, 20, 27, 22, 31, 24, 29, 24, 32, 26, 37, 28, 30, 28, 37, 28, 41, 30, 33, 32, 41, 32, 43, 34, 40, 34, 43, 34 (list; graph; listen)

	OFFSET	`1,5`
	COMMENT	`a(n) is odd iff n is even and n/2 is not prime.`
	EXAMPLE	`5=1+4=2+3=3+2=4+1, hence a(5)=2;` `6=1+5=2+4=3+3=4+2=5+1, hence a(6)=0.`
	CROSSREFS	`Cf. A073610.` `Sequence in context: A029222 A162350 A125922 this_sequence A068461 A130456 A071497` `Adjacent sequences: A076605 A076606 A076607 this_sequence A076609 A076610 A076611`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 21 2002`

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

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