login
Numbers k such that (3*2^k+1)^2-2 is prime.
0

%I #13 Mar 18 2023 22:52:57

%S 1,2,4,10,13,19,20,34,37,40,317,1258,1651,3370,3640,3715,6818,6925,

%T 8050,18193

%N Numbers k such that (3*2^k+1)^2-2 is prime.

%C Next term is > 21000. - _Ryan Propper_, Sep 03 2005

%H S. Harvey, <a href="http://harvey563.tripod.com/Carol_Kynea.txt">Carol and Kynea Primes</a>.

%o (PARI) is(n)=ispseudoprime((3*2^n+1)^2-2) \\ _Charles R Greathouse IV_, Feb 19 2016

%K nonn

%O 1,2

%A _Ray Chandler_, Nov 21 2004

%E One more term from _Ryan Propper_, Sep 03 2005