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A063791 Numbers n such that 2^(n+1) - n - 2 is prime. 2

%I

%S 3,9,13,15,25,49,55,69,115,2071,6249,13669,14215,14625,396127

%N Numbers n such that 2^(n+1) - n - 2 is prime.

%D Dean Hickerson, personal communication.

%F a(n) = A099439(n) - 1. - _Hugo Pfoertner_, Jul 24 2019

%o (PARI) for(n=1,5000, if(isprime(2^(n+1)-n-2),print(n)))

%Y Cf. A099439.

%K nonn

%O 1,1

%A _Jason Earls_, Aug 17 2001

%E More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 03 2008

%E a(15) from _Karsten Bonath_, Jun 07 2018

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Last modified October 25 17:22 EDT 2021. Contains 348255 sequences. (Running on oeis4.)