A217353 - OEIS

%I #21 Sep 15 2024 14:31:32

%S 1,2,3,4,8,50,58,71,112,1079,1318,2252,3524,4800,5560,6919,11484,

%T 12184,41099,94711,375460,449248

%N Numbers k such that 8^k - 3 is prime.

%C 3*A217353 is a subsequence of A050414. - _Bruno Berselli_, Oct 02 2012

%t Select[Range[5000], PrimeQ[8^# - 3] &]

%o (PARI) is(n)=ispseudoprime(8^n-3) \\ _Charles R Greathouse IV_, May 22 2017

%Y Cf. A050414, A059266, A217354.

%K nonn,more

%O 1,2

%A _Vincenzo Librandi_, Oct 02 2012

%E a(15)-a(17), a(19)-a(20) using A050414 by _Bruno Berselli_, Oct 02 2012

%E a(18), a(21)-a(22) using A050414 by _Michael S. Branicky_, Sep 15 2024