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A199165 Numbers n such that (6^n-11)/5 is prime.

%I A199165 #40 Jun 19 2020 04:01:29
%S A199165 2,3,4,5,14,19,21,50,53,136,146,1255,1448,1839,2053,2496,4060,5041,
%T A199165 8410,14090,14940,19759,29871,44836,78175,114398,120946,137845,461108,
%U A199165 727496,840316
%N A199165 Numbers n such that (6^n-11)/5 is prime.
%H A199165 Henri & Renaud Lifchitz, <a href="http://www.primenumbers.net/prptop/searchform.php?form=%286%5En-11%29%2F5&amp;action=Search">PRP Records</a>.
%e A199165 a(4) = 5  because  (6^5-11)/5 = 1553  is prime.
%t A199165 lst={}; Do[If[PrimeQ[(6^n-11)/5], Print[n]; AppendTo[lst, n]], {n, 10^6}]; lst
%o A199165 (PARI) is(n)=ispseudoprime((6^n-11)/5) \\ _Charles R Greathouse IV_, Jun 13 2017
%Y A199165 Cf. A004062, A165210, A198725.
%K A199165 nonn,more
%O A199165 1,1
%A A199165 _Gilbert Mozzo_, Nov 03 2011
%E A199165 a(23)-a(28) are probable primes discovered by _Paul Bourdelais_, Nov 15 2011
%E A199165 a(23)-a(28) independently confirmed as probable primes using Mathematica PrimeQ function by _Gilbert Mozzo_, Nov 21 2011
%E A199165 a(29) corresponds to a probable prime discovered by _Paul Bourdelais_, Apr 25 2019
%E A199165 a(30) corresponds to a probable prime discovered by _Paul Bourdelais_, Aug 12 2019
%E A199165 a(31) corresponds to a probable prime discovered by _Paul Bourdelais_, Jun 18 2020