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A073444
Primes of the form n! - n - 1.
1
2, 19, 3628789, 479001587
OFFSET
1,1
COMMENTS
a(2) = 3628789 through a(4), a 730-digit number, have been certified prime with Primo.
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: A091688 A306207 A355466 * A301637 A366333 A366331
KEYWORD
nonn
AUTHOR
Rick L. Shepherd, Jul 31 2002
STATUS
approved