A076211 Numbers n such that (-n!!+(n+1)!!-1)/2 is prime.

3, 4, 7, 9, 17, 25, 28, 55, 73, 130, 172, 327, 601, 1201, 2329

Offset

1,1

Links

Table of n, a(n) for n=1..15.

Crossrefs

Cf. A006882 (double factorials), A076208, A076209, A076210.

Sequence in context: A108796 A364684 A048849 * A167186 A221212 A218278

Adjacent sequences: A076208 A076209 A076210 * A076212 A076213 A076214

Keyword

nonn

Author

Zak Seidov, Nov 02 2002

Extensions

More terms (checked n<5000) from Hugo Pfoertner, Jun 22 2003

Status

approved