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A052290
Prime values of n!*2^n+n+1 = A000165(n)+n+1.
1
2, 11, 389, 1961990553613, 1678343852714360832019, 25563186766285862273530264901662157745369907200000037
OFFSET
1,1
COMMENTS
For a(6), n = 36. There are no additional terms up to n=1000. - Harvey P. Dale, Aug 06 2012
Primes for n = 0, 2, 4, 12, 18, 36, and no others for n < 5001. - Robert G. Wilson v, Aug 07 2012
EXAMPLE
If n=4, 2^4*4!+4+1 = 389 is prime, so 389 is a term.
MATHEMATICA
Select[Table[n! 2^n+n+1, {n, 0, 1000}], PrimeQ] (* Harvey P. Dale, Aug 06 2012 *)
CROSSREFS
Sequence in context: A229268 A309068 A015180 * A145512 A013046 A012950
KEYWORD
nonn
AUTHOR
Labos Elemer, Feb 08 2000
STATUS
approved