A073827 Numbers n such that 1 + 0!*1!*2!*...*n! is prime.

0, 1, 2, 3, 7, 14

Offset

1,3

Comments

Any additional terms are greater than 115 with the next prime having 9744 or more digits.

Links

Table of n, a(n) for n=1..6.

Prog

(PARI) pr=1; for(n=0, 115, pr=pr*n!; if(isprime(pr+1), print1(n, ", ")))

Crossrefs

Cf. A073828 (corresponding primes), A000178 (superfactorials), A019515.

Sequence in context: A006695 A128157 A259488 * A081940 A082270 A055688

Adjacent sequences: A073824 A073825 A073826 * A073828 A073829 A073830

Keyword

nonn

Author

Rick L. Shepherd, Aug 16 2002

Status

approved