A154661 - OEIS

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A154661

Numbers n such that n!-+257 are primes.

3, 4, 6, 7, 8, 18 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`6!-257=463;6!+257=977,...`
	MATHEMATICA	`lst={}; a=257; Do[If[PrimeQ[n!-a]&&PrimeQ[n!+a], AppendTo[lst, n]], {n, 2*5!}]; lst`
	CROSSREFS	`Cf. A144046, A154660` `Sequence in context: A085149 A007370 A044813 * A087753 A070762 A061208` `Adjacent sequences: A154658 A154659 A154660 * A154662 A154663 A154664`
	KEYWORD	`nonn`
	AUTHOR	`Vladimir Orlovsky (4vladimir(AT)gmail.com), Jan 13 2009`

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Last modified February 17 19:13 EST 2012. Contains 206085 sequences.