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 A102870 Primes of the form 3^k + 8. 10

%I #15 Nov 10 2023 20:28:26

%S 11,17,89,251,6569,1594331,4782977,3486784409,1350851717672992097,

%T 984770902183611232889,5474401089420219382077155933569751771,

%U 969773729787523602876821942164080815560169

%N Primes of the form 3^k + 8.

%H Vincenzo Librandi, <a href="/A102870/b102870.txt">Table of n, a(n) for n = 1..16</a>

%F a(n) = 3^A217136(n) + 8. - _Elmo R. Oliveira_, Nov 09 2023

%t a = Delete[Union[Flatten[Table[If [PrimeQ[3^n + 8] == True, 3^n + 8, 0], {n, 1, 200}]]], 1]

%t Select[Table[3^n+8,{n,0,200}],PrimeQ] (* _Vincenzo Librandi_, Jul 19 2012 *)

%o (Magma) [ a: n in [0..100] | IsPrime(a) where a is 3^n+8 ]; // _Vincenzo Librandi_, Jul 19 2012

%Y Cf. A000040, A217136 (corresponding k's).

%K nonn

%O 1,1

%A _Roger L. Bagula_, Mar 01 2005

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Last modified November 29 16:39 EST 2023. Contains 367445 sequences. (Running on oeis4.)