A098864 Numbers k such that (6^k)*(2^k - 1) + 1 is prime.

1, 2, 4, 8, 15, 46, 58, 74, 262, 898, 13110, 20256, 21632

Offset

1,2

Comments

a(11) > 11200. - Jinyuan Wang, Mar 19 2020

Links

Table of n, a(n) for n=1..13.

Prog

(PARI) is(n)=ispseudoprime((6^n)*(2^n-1)+1) \\ Charles R Greathouse IV, Jun 13 2017
(Magma) [k: k in [1..300] | IsPrime((6^k)*(2^k-1)+1)]; // Jinyuan Wang, Mar 19 2020

Crossrefs

Cf. A098863 ((6^k)*(2^k - 1) - 1 is prime).

Sequence in context: A108693 A371351 A026096 * A002546 A289089 A010745

Adjacent sequences: A098861 A098862 A098863 * A098865 A098866 A098867

Keyword

nonn,more

Author

Pierre CAMI, Oct 12 2004

Extensions

a(11)-a(13) from Michael S. Branicky, Apr 22 2023

Status

approved