id:A064983 - OEIS Search Results

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

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3, 3, 2, 2, 2, 2, 2, 2, 5, 3, 29, 11, 3, 5, 2, 2, 53, 2, 67, 79, 5, 61, 2, 7, 13, 5, 3, 11, 2, 107, 43, 7, 31, 199, 293, 17, 43, 197, 109, 41, 13, 277, 11, 167, 17, 83, 157, 31, 199, 131, 13, 5, 89, 47, 223, 83, 43, 7, 139, 151, 211, 19, 19, 23, 43, 311, 61, 53, 191, 163, 11 (list; graph; listen)

	OFFSET	`0,1`
	MATHEMATICA	`Do[k = 1; While[ !PrimeQ[ Prime[k]*n! - 1], k++ ]; Print[ Prime[k]], {n, 1, 75} ]`
	CROSSREFS	`Cf. A051888.` `Sequence in context: A102905 A020862 A131589 this_sequence A124933 A133884 A065775` `Adjacent sequences: A064980 A064981 A064982 this_sequence A064984 A064985 A064986`
	KEYWORD	`easy,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Oct 30 2001`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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