id:A076208 - OEIS Search Results

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

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1, 2, 9, 15, 16, 17, 25, 64, 65, 88, 113, 135, 161, 225, 783, 967, 5135 (list; graph; listen)

	OFFSET	`1,2`
	CROSSREFS	`Cf. A006882 (double factorials), A076208, A076210, A076211.` `Sequence in context: A024470 A024472 A128780 this_sequence A057481 A083288 A063105` `Adjacent sequences: A076205 A076206 A076207 this_sequence A076209 A076210 A076211`
	KEYWORD	`nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), Nov 02 2002`
	EXTENSIONS	`More terms (checked n<5300) from Hugo Pfoertner (hugo(AT)pfoertner.org), Jun 22 2003`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.