A096149 Numbers k such that (2^k-3)*2^k+1 is prime.

2, 3, 5, 7, 9, 11, 13, 15, 19, 35, 39, 45, 51, 59, 213, 607, 1315, 1435, 3901, 4921, 5255, 16441, 61453

Offset

1,1

Comments

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

Links

Table of n, a(n) for n=1..23.

Prog

(PARI) is(n)=ispseudoprime((2^n-3)*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A129895 A256212 A360107 * A033055 A287374 A186390

Adjacent sequences: A096146 A096147 A096148 * A096150 A096151 A096152

Keyword

nonn,more,hard

Author

Jason Earls, Jul 24 2004

Extensions

a(22) from Michael S. Branicky, Mar 26 2023

a(23) from Michael S. Branicky, Oct 22 2024

Status

approved