OFFSET
0,1
COMMENTS
First five terms coincide with A118332 because n!! + (n+1)!! is prime for n = 0, 1, 2, 3, 4. At n>4, n!! + (n+1)!! is always composite.
LINKS
Harvey P. Dale, Table of n, a(n) for n = 0..100
MATHEMATICA
Table[FactorInteger[n!!+(n+1)!! ][[ -1, 1]], {n, 0, 40}]
FactorInteger[#][[-1, 1]]&/@(Total/@Partition[Range[0, 40]!!, 2, 1]) (* Harvey P. Dale, Mar 22 2019 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Zak Seidov, Apr 23 2006
STATUS
approved