id:A114995 - OEIS Search Results

Search: id:A114995

Displaying 1-1 of 1 results found.

page 1

Numbers n such that the sum of the first n double factorials (1!!+2!!+...+n!!) is prime.

+0
1

2, 5, 9, 10, 13, 14, 22, 25, 50, 66, 125, 250, 293, 314, 349, 1622, 1642 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Next term must be greater than 2300. The sum of the first 1642 double factorials is a (probable) prime with 2286 digits.`
	EXAMPLE	`5 belongs since 1!!+2!!+3!!+4!!+5!! = 29, a prime.`
	CROSSREFS	`Cf. A114410, A079078.` `Sequence in context: A100530 A055394 A078360 this_sequence A047619 A046711 A095347` `Adjacent sequences: A114992 A114993 A114994 this_sequence A114996 A114997 A114998`
	KEYWORD	`nonn`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 23 2006`

page 1

Search completed in 0.002 seconds

Last modified November 18 20:14 EST 2008. Contains 147244 sequences.