id:A051888 - OEIS Search Results

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a(n) = smallest prime p such that p*n! + 1 is prime.

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8

2, 2, 2, 2, 3, 2, 3, 3, 7, 3, 3, 5, 2, 3, 13, 7, 31, 5, 2, 7, 17, 67, 41, 3, 13, 3, 43, 17, 97, 7, 29, 109, 3, 71, 5, 2, 7, 41, 3, 59, 3, 11, 29, 7, 107, 67, 79, 3, 743, 149, 163, 2, 211, 2, 19, 71, 73, 23, 37, 113, 149, 67, 41, 617, 107, 37, 107, 283, 113, 19, 239, 107, 73, 97, 5 (list; graph; listen)

	OFFSET	`0,1`
	FORMULA	`Analogous to or subset of A051686; generalization of A005384`
	MATHEMATICA	`Do[k = 1; While[ !PrimeQ[ Prime[k]*n! + 1], k++ ]; Print[ Prime[k]], {n, 1, 75} ]`
	CROSSREFS	`A005384, A051686, A051886, A051887.` `Sequence in context: A070098 A029233 A147981 this_sequence A088019 A126759 A029348` `Adjacent sequences: A051885 A051886 A051887 this_sequence A051889 A051890 A051891`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Dec 15 1999`
	EXTENSIONS	`More terms from James A. Sellers (sellersj(AT)math.psu.edu), Dec 16 1999`

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

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