A103740 - OEIS

A103740

Numbers n such that n! * F(n) + 1 is prime.

1, 2, 3, 4, 5, 7, 8, 10, 11, 15, 41, 98, 149, 193, 233, 265, 403, 898, 935, 1291, 2079 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	COMMENTS	`All values through 2079 have been proved prime with WinPFGW. No more terms up to 6700. Primality testing 2079!F(2079)+1 [N-1, Brillhart-Lehmer-Selfridge] Running N-1 test using base 2087 Running N-1 test using base 2099 Calling Brillhart-Lehmer-Selfridge with factored part 33.88% 2079!F(2079)+1 is prime! (15.2535s+0.0043s)` `No more terms < 6729. - David Wasserman, Apr 24 2008`
	LINKS	`Table of n, a(n) for n=1..21.`
	EXAMPLE	`a(6)=7 because 7!*fibonacci(7)+1 = 65521, a prime.`
	CROSSREFS	`Cf. A005443.` `Sequence in context: A219040 A305414 A317296 * A317578 A306435 A034155` `Adjacent sequences: A103737 A103738 A103739 * A103741 A103742 A103743`
	KEYWORD	`nonn,less`
	AUTHOR	`Jason Earls, Mar 28 2005`
	STATUS	`approved`

Last modified February 6 04:04 EST 2023. Contains 360092 sequences. (Running on oeis4.)