A124249 - OEIS

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A124249

Numbers n such that n!!-2^n is prime.

9, 13, 21, 25, 27, 35, 41, 53, 63, 81, 123, 333, 381, 413, 1187, 2265, 3153, 4211, 4887, 7359 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`All terms are odd.`
	EXAMPLE	`9 is in the sequence because 9!!-2^9=433 is prime.`
	CROSSREFS	`Cf. A124248.` `Sequence in context: A090415 A026283 A026045 * A137168 A033870 A151901` `Adjacent sequences: A124246 A124247 A124248 * A124250 A124251 A124252`
	KEYWORD	`more,nonn`
	AUTHOR	`Farideh Firoozbakht (mymontain(AT)yahoo.com), Nov 27 2006`
	EXTENSIONS	`Three more terms from Ryan Propper (rpropper(AT)cs.stanford.edu), Nov 05 2007`

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Last modified February 17 23:33 EST 2012. Contains 206085 sequences.