A096149 - OEIS

%I #23 Oct 22 2024 09:44:27

%S 2,3,5,7,9,11,13,15,19,35,39,45,51,59,213,607,1315,1435,3901,4921,

%T 5255,16441,61453

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

%C a(1) through a(21) have been proved to be prime with WinPFGW. No more terms up to 10000.

%o (PARI) is(n)=ispseudoprime((2^n-3)*2^n+1) \\ _Charles R Greathouse IV_, Jun 13 2017

%K nonn,more,hard

%O 1,1

%A _Jason Earls_, Jul 24 2004

%E a(22) from _Michael S. Branicky_, Mar 26 2023

%E a(23) from _Michael S. Branicky_, Oct 22 2024