

A049433


Numbers n such that n!(n1)!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
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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!(61)!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



