id:A016014 - OEIS Search Results

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Proth numbers: least k such that 2*n*k + 1 is a prime.

+0
8

1, 1, 1, 2, 1, 1, 2, 1, 1, 2, 1, 3, 2, 1, 1, 3, 3, 1, 5, 1, 1, 2, 1, 2, 2, 1, 2, 2, 1, 1, 5, 3, 1, 2, 1, 1, 2, 3, 1, 3, 1, 4, 2, 1, 2, 3, 3, 1, 2, 1, 1, 3, 1, 1, 3, 1, 2, 2, 6, 2, 3, 3, 1, 2, 1, 3, 2, 1, 1, 2, 4, 3, 2, 1, 1, 3, 3, 1, 2, 4, 1, 5, 1, 2, 6, 1, 2, 2, 1, 1, 3, 7, 2, 5, 1, 1, 2, 1, 1 (list; graph; listen)

	OFFSET	`1,4`
	MATHEMATICA	`Do[k = 1; cp = nk + 1; While[ ! PrimeQ[cp], k++; cp = nk + 1]; Print[k], {n, 2, 400, 2}] (from Lei Zhou (lzhou5(AT)emory.edu), Feb 23 2005)`
	CROSSREFS	`Adjacent sequences: A016011 A016012 A016013 this_sequence A016015 A016016 A016017` `Sequence in context: A025434 A111178 A076845 this_sequence A067760 A078680 A050412`
	KEYWORD	`nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com)`

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Last modified May 16 23:01 EDT 2008. Contains 139884 sequences.

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