login
A076209
Numbers n such that (n!!+(n+1)!!-1)/2 is prime.
3
2, 3, 4, 5, 28, 35, 61, 75, 218, 267, 395, 844, 1509, 2122, 4157
OFFSET
1,1
CROSSREFS
Cf. A006882 (double factorials), A076208, A076210, A076211.
Sequence in context: A115337 A114333 A265098 * A037399 A220891 A220890
KEYWORD
nonn
AUTHOR
Zak Seidov, Nov 02 2002
EXTENSIONS
More terms (checked n<5000) from Hugo Pfoertner, Jun 22 2003
STATUS
approved