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A049432 Numbers n such that n!-(n-1)!+1 is prime. 5
2, 3, 4, 5, 6, 8, 13, 20, 24, 46, 59, 150, 152, 198, 683, 880, 1135, 1907, 6617, 10243 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(21) > 12000. [From Donovan Johnson, Dec 18 2009]

LINKS

Table of n, a(n) for n=1..20.

Index entries for sequences related to factorial numbers

EXAMPLE

6!-(6-1)!+1 = 601 is prime.

CROSSREFS

Cf. A049984, A049433.

Sequence in context: A133430 A033071 A306075 * A102516 A156981 A271949

Adjacent sequences:  A049429 A049430 A049431 * A049433 A049434 A049435

KEYWORD

nonn

AUTHOR

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

EXTENSIONS

More terms from Farideh Firoozbakht, Jul 18 2003

a(17)-a(20) from Donovan Johnson, Dec 18 2009

STATUS

approved

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Last modified April 17 19:51 EDT 2021. Contains 343070 sequences. (Running on oeis4.)