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A073827
Numbers n such that 1 + 0!*1!*2!*...*n! is prime.
1
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.
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: A128157 A259488 A372229 * A081940 A082270 A055688
KEYWORD
nonn
AUTHOR
Rick L. Shepherd, Aug 16 2002
STATUS
approved