id:A072681 - OEIS Search Results

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(n - A007917(n)) * (A007918(n) - n).

+0
2

0, 0, 1, 0, 1, 0, 3, 4, 3, 0, 1, 0, 3, 4, 3, 0, 1, 0, 3, 4, 3, 0, 5, 8, 9, 8, 5, 0, 1, 0, 5, 8, 9, 8, 5, 0, 3, 4, 3, 0, 1, 0, 3, 4, 3, 0, 5, 8, 9, 8, 5, 0, 5, 8, 9, 8, 5, 0, 1, 0, 5, 8, 9, 8, 5, 0, 3, 4, 3, 0, 1, 0, 5, 8, 9, 8, 5, 0, 3, 4, 3, 0, 5, 8, 9, 8, 5, 0, 7, 12, 15, 16, 15, 12, 7, 0, 3, 4, 3, 0, 1, 0 (list; graph; listen)

	OFFSET	`2,7`
	COMMENT	`a(n)=0 iff n is prime.`
	FORMULA	`a(n) = A064722(n) * (A072680(n) - A064722(n)).`
	CROSSREFS	`a(n) = A064722(n) * A007920(n).` `Sequence in context: A019474 A072565 A059114 this_sequence A064460 A108481 A078070` `Adjacent sequences: A072678 A072679 A072680 this_sequence A072682 A072683 A072684`
	KEYWORD	`nonn,nice`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Jul 01 2002`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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