id:A109909 - OEIS Search Results

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a(n) = number of primes of the form k*(n-k)-1.

+0
3

0, 0, 0, 2, 2, 1, 2, 1, 4, 1, 3, 2, 3, 2, 3, 2, 4, 3, 5, 1, 10, 1, 5, 5, 4, 2, 6, 3, 5, 3, 9, 4, 11, 3, 5, 5, 5, 5, 14, 1, 6, 6, 7, 6, 11, 5, 8, 4, 15, 3, 13, 4, 10, 9, 6, 5, 11, 4, 12, 5, 13, 4, 12, 4, 6, 11, 13, 4, 12, 6, 15, 12, 9, 4, 9, 5, 10, 8, 10, 3, 28, 7, 11, 15, 6, 9, 20, 7, 20, 6, 17, 5, 23 (list; graph; listen)

	OFFSET	`1,4`
	COMMENT	`Conjecture: a(n) > 0 for n > 3.`
	CROSSREFS	`Cf. A109904, A109905, A026728, A109907, A109908.` `Sequence in context: A106029 A105153 A000924 this_sequence A144387 A030768 A051480` `Adjacent sequences: A109906 A109907 A109908 this_sequence A109910 A109911 A109912`
	KEYWORD	`nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jul 15 2005`
	EXTENSIONS	`More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Aug 15 2005`

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

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