A081712 - OEIS

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A081712

n! - n# + 1 is prime, where n# is the primorial function.

4, 6, 7, 8, 10, 20, 21, 26, 101, 119, 172, 409, 621, 1043, 1204, 1283, 1673, 2003, 4336, 5773, 12913, 13517 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,1`
	COMMENTS	`Some of the larger entries may only correspond to probable primes.`
	LINKS	`Mike Oakes, Primo-factorials` `Joe McLean, Interesting Sources of Probable Primes`
	EXAMPLE	`a(1)=4 because 4!-4#+1=19 is prime`
	CROSSREFS	`Sequence in context: A203168 A139490 A030375 * A178663 A084395 A047291` `Adjacent sequences: A081709 A081710 A081711 * A081713 A081714 A081715`
	KEYWORD	`nonn`
	AUTHOR	`Mike Oakes (mikeoakes2(AT)aol.com), Apr 04 2003`
	EXTENSIONS	`More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 03 2008`

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Last modified February 14 14:07 EST 2012. Contains 205623 sequences.