A122042 - OEIS

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A122042

Numbers n such that (2^n+n)/(n+2) is prime.

13, 19, 55, 469, 3385 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`All terms are also in A081765 = numbers n such that n+2 divides 2^(n-1)-1.`
	MATHEMATICA	`Do[If[PrimeQ[(2^n+n)/(n+2)], Print[n]], {n, 1, 5000}]`
	CROSSREFS	`Cf. A081765.` `Sequence in context: A156940 A180528 A109504 * A174343 A158332 A180531` `Adjacent sequences: A122039 A122040 A122041 * A122043 A122044 A122045`
	KEYWORD	`more,nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), Sep 14 2006`
	EXTENSIONS	`a(5) from Alexander Adamchuk (alex(AT)kolmogorov.com), Sep 17 2006`

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Last modified February 17 02:08 EST 2012. Contains 205978 sequences.