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 A163115 Primes of the form 2^n + 2*n + 1. 6

%I #16 Jan 22 2017 17:47:32

%S 2,5,43,8219,36893488147419103363,38685626227668133590597803,

%T 862718293348820473429344482784628181556388621521298319395315527975371

%N Primes of the form 2^n + 2*n + 1.

%C The corresponding values of n, i.e., 0, 1, 5, 13, 65, 85, 229, ... are of the form A192764() - 1. - _Juri-Stepan Gerasimov_, Jul 25 2011

%C The next term, a(8), has 604 digits. - _Harvey P. Dale_, Dec 17 2013

%e a(1) = 2^0 + 2*0 + 1 = 2.

%e a(2) = 2^1 + 2*1 + 1 = 5.

%e a(3) = 2^5 + 2*5 + 1 = 43.

%e a(4) = 2^13 + 2*13 + 1 = 8219.

%t Select[Table[2^n+2n+1,{n,0,300}],PrimeQ] (* _Harvey P. Dale_, Dec 17 2013 *)

%K nonn

%O 1,1

%A _Juri-Stepan Gerasimov_, Jul 21 2009

%E 13 removed, 3 terms added by _R. J. Mathar_, Jul 27 2009

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Last modified April 19 23:40 EDT 2024. Contains 371798 sequences. (Running on oeis4.)