id:A086545 - OEIS Search Results

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Smallest k such that nk+1 is a prime and and (n-1)/k is non-composite, or 0 if no such number exists.

+0
1

1, 2, 1, 2, 1, 6, 0, 4, 3, 2, 1, 4, 0, 2, 15, 8, 1, 0, 0, 10, 3, 2, 0, 24, 5, 0, 27, 0, 1, 10, 0, 0, 3, 2, 5, 0, 0, 2, 13, 20, 1, 0, 0, 4, 15, 0, 0, 0, 0, 50, 3, 0, 0, 18, 5, 8, 19, 0, 1, 12, 0, 2, 9, 32, 5, 66, 0, 4, 3, 0, 1, 24, 0, 2, 25, 38, 7, 78, 0, 16, 0, 2, 0, 12, 5, 0, 0, 44, 89, 30, 0, 4, 3, 2 (list; graph; listen)

	OFFSET	`2,2`
	EXAMPLE	`a(7) = 6 as 76 +1=43 is a prime and (7-1)/6 = 1 is non-composite. a(10) = 3 as 103 +1 = 31 and (10-1)/3 = 3 both are primes.`
	CROSSREFS	`Adjacent sequences: A086542 A086543 A086544 this_sequence A086546 A086547 A086548` `Sequence in context: A109087 A102048 A102551 this_sequence A126083 A071416 A053589`
	KEYWORD	`nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Aug 26 2003`
	EXTENSIONS	`Corrected and extended by David Wasserman (wasserma(AT)spawar.navy.mil), Mar 22 2005`

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Last modified October 7 08:31 EDT 2008. Contains 144667 sequences.

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