A067026 - OEIS

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A067026

(Primorial(n) - 4)/2 is a prime

3, 4, 5, 6, 7, 8, 9, 11, 13, 16, 20, 27, 39, 83, 103, 122, 129, 145, 279, 393 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`n such that [A002110(n)/2]-2 is prime.`
	MATHEMATICA	`p = 1; Do[p = p*Prime[n]; If[PrimeQ[(p - 4)/2], Print[n]], {n, 1, 400} ]`
	CROSSREFS	`Cf. A002110, A067024, A067027.` `Sequence in context: A189080 A039113 A130399 * A096829 A039120 A075493` `Adjacent sequences: A067023 A067024 A067025 * A067027 A067028 A067029`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Dec 29 2001`
	EXTENSIONS	`More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 30 2001`

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Last modified February 16 15:27 EST 2012. Contains 205930 sequences.