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A049433 Numbers n such that n!-(n-1)!-1 is prime. 5
3, 4, 6, 8, 9, 12, 28, 78, 99, 184, 286, 291, 398, 411, 600, 718, 732, 889, 1963, 2240, 2242, 2533, 8800, 11403 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

There is no further term up to 1400. - Farideh Firoozbakht, Jul 18 2003

a(25) > 12000. [From Donovan Johnson, Dec 18 2009]

LINKS

Table of n, a(n) for n=1..24.

Index entries for sequences related to factorial numbers

EXAMPLE

6!-(6-1)!-1 = 599 is prime.

CROSSREFS

Cf. A049432, A049985.

Cf. A001272, A002981, A002982.

Sequence in context: A036446 A284469 A059267 * A250984 A135251 A298809

Adjacent sequences:  A049430 A049431 A049432 * A049434 A049435 A049436

KEYWORD

nonn

AUTHOR

Paul Jobling (paul.jobling(AT)whitecross.com)

EXTENSIONS

More terms from Farideh Firoozbakht, Jul 18 2003

Corrected offset, edited definition and a(19)-a(24) from Donovan Johnson, Dec 18 2009

STATUS

approved

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Last modified September 26 11:15 EDT 2020. Contains 337358 sequences. (Running on oeis4.)