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A076208 Numbers n such that (n!!+(n+1)!!+1)/2 is prime. 3
1, 2, 9, 15, 16, 17, 25, 64, 65, 88, 113, 135, 161, 225, 783, 967, 5135 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
Table of n, a(n) for n=1..17.
CROSSREFS
Cf. A006882 (double factorials), A076209, A076210, A076211.
Sequence in context: A128780 A178849 A217367 * A057481 A359775 A353317
Adjacent sequences: A076205 A076206 A076207 * A076209 A076210 A076211
KEYWORD
nonn
AUTHOR
Zak Seidov, Nov 02 2002
EXTENSIONS
More terms (checked n<5300) from Hugo Pfoertner, Jun 22 2003
STATUS
approved

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Last modified June 6 00:30 EDT 2024. Contains 373110 sequences. (Running on oeis4.)