%I #11 Oct 16 2015 04:39:42
%S 0,1,3,9,43,79,175,11325,13359,18577
%N Numbers n such that 2*11^n + 1 is prime.
%C a(11) > 2*10^5. - _Robert Price_, Oct 16 2015
%t Join[{0}, Select[Range[1, 175, 2], PrimeQ[2*11^# + 1] &]] (* _Arkadiusz Wesolowski_, Nov 06 2012 *)
%o (PARI) for(n=0, 1e5, if(isprime(2*11^n + 1), print1(n", "))) \\ _Altug Alkan_, Oct 16 2015
%Y Cf. A141798, A190942, A068231.
%K hard,nonn
%O 1,3
%A _Rick L. Shepherd_, Jul 03 2008
%E a(8)-a(10) from _Arkadiusz Wesolowski_, Nov 06 2012