A076209 - OEIS

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A076209

Numbers n such that (n!!+(n+1)!!-1)/2 is prime.

2, 3, 4, 5, 28, 35, 61, 75, 218, 267, 395, 844, 1509, 2122, 4157 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	CROSSREFS	`Cf. A006882 (double factorials), A076208, A076210, A076211.` `Sequence in context: A051143 A084853 A115337 * A037399 A086130 A024636` `Adjacent sequences: A076206 A076207 A076208 * A076210 A076211 A076212`
	KEYWORD	`nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), Nov 02 2002`
	EXTENSIONS	`More terms (checked n<5000) from Hugo Pfoertner (hugo(AT)pfoertner.org), Jun 22 2003`

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Last modified February 17 16:13 EST 2012. Contains 206050 sequences.