A single integer N = a complete chess game

[Maximilian Hasler]

Arthur !

A139035  a(n) = numbers k for which k!!-1 is prime.
AUTHOR  Artur Jasinski (grafix(AT)csl.pl), Apr 07 2008

is the same as:

A007749 		Numbers n such that n!! - 1 is prime.


Btw, you might be interested in other search hits for  3,4,6,8,16...
e.g. the duplicate

A122036 Numbers n such that 9*10^n+11 is prime.
A111023 Integers n such that 9*10^n+11 is a prime number.  	 	 +20

Maximilian