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A118332 Primes of the form n!! + (n+1)!!. 1

%I

%S 2,3,5,11,23

%N Primes of the form n!! + (n+1)!!.

%C These are all primes of the form n!! + (n+1)!! Corresponding values of n are 0, 1, 2, 3, 4. At n>4, n!! + (n+1)!! is always composite, cf. A118333.

%C Apparently also the set of primes p(n) such that p(n)^2 - 2^n is prime. - _Irina Gerasimova_, May 09 2013

%Y Cf. A118333.

%K fini,full,nonn

%O 1,1

%A _Zak Seidov_, Apr 23 2006

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Last modified May 6 09:45 EDT 2021. Contains 343580 sequences. (Running on oeis4.)