id:A076211 - OEIS Search Results

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

+0
4

3, 4, 7, 9, 17, 25, 28, 55, 73, 130, 172, 327, 601, 1201, 2329 (list; graph; listen)

	OFFSET	`1,1`
	CROSSREFS	`Cf. A006882 (double factorials), A076208, A076209, A076210.` `Sequence in context: A086336 A108796 A048849 this_sequence A167186 A101062 A003669` `Adjacent sequences: A076208 A076209 A076210 this_sequence A076212 A076213 A076214`
	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 December 15 00:47 EST 2009. Contains 170825 sequences.