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A073444 Primes of the form n! - n - 1. 1
2, 19, 3628789, 479001587 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(2) = 3628789 through a(4), a 730-digit number, have been certified prime with Primo.

LINKS

Table of n, a(n) for n=1..4.

FORMULA

a(k) = A073443(k)! - A073443(k) - 1.

EXAMPLE

a(1) = 4! - 4 - 1 = 19, a prime, so 19 is in this sequence (4 = A073443(1)).

PROG

(PARI) for(n=3, 2000, p=n!-n-1; if(isprime(p), print1(p, ", ")))

CROSSREFS

Cf. A073443 (corresponding n).

Sequence in context: A094663 A274762 A091688 * A301637 A210416 A220943

Adjacent sequences:  A073441 A073442 A073443 * A073445 A073446 A073447

KEYWORD

nonn

AUTHOR

Rick L. Shepherd, Jul 31 2002

STATUS

approved

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Last modified November 15 04:00 EST 2018. Contains 317225 sequences. (Running on oeis4.)