id:A026728 - OEIS Search Results

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Number of primes of form x*y+1 with x+y=n.

+0
1

0, 1, 1, 1, 2, 0, 3, 2, 1, 1, 4, 1, 6, 1, 1, 2, 8, 1, 5, 3, 1, 4, 7, 1, 7, 1, 4, 5, 8, 0, 10, 6, 2, 2, 7, 1, 9, 8, 4, 4, 14, 1, 16, 3, 3, 5, 12, 3, 7, 7, 4, 11, 21, 0, 11, 4, 7, 6, 11, 2, 12, 9, 7, 10, 7, 1, 22, 7, 7, 5, 17, 3, 23, 10, 2, 9, 19, 2, 19, 8, 5, 8, 23, 1, 16, 6, 4, 11, 14, 4, 16, 12 (list; graph; listen)

	OFFSET	`1,5`
	EXAMPLE	`n=16: {m: m=x*y+1 and x+y=16} = {16,29,40,49,56,61,64,65} containing two primes: 29 and 61, therefore a(16)=2.`
	CROSSREFS	`Adjacent sequences: A026725 A026726 A026727 this_sequence A026729 A026730 A026731` `Sequence in context: A127479 A115241 A097418 this_sequence A109906 A090722 A082785`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Jan 27 2004`

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Last modified May 16 19:35 EDT 2008. Contains 139737 sequences.

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