A098864 - OEIS

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

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OFFSET

1,2

COMMENTS

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

LINKS

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).

KEYWORD

nonn,more

AUTHOR

Pierre CAMI, Oct 12 2004

EXTENSIONS

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

STATUS

approved