A098856 - OEIS

A098856

Numbers k such that 4^k*(2^k - 1) + 1 is a prime.

1, 3, 19, 34, 51, 318, 3670, 6348, 33292, 48582, 50235, 50964

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OFFSET

1,2

COMMENTS

a(9) > 11500. - Jinyuan Wang, Mar 19 2020

LINKS

PROG

(Magma) [k: k in [1..500] | IsPrime(4^k*(2^k-1)+1)]; // Jinyuan Wang, Mar 19 2020

CROSSREFS

Cf. A098857 ((4^k)*(2^k - 1) - 1 is prime).

KEYWORD

nonn,more

AUTHOR

Pierre CAMI, Oct 11 2004

EXTENSIONS

6348, corresponding to a probable prime, from Ryan Propper, Jun 18 2005

Edited by T. D. Noe, Oct 30 2008

a(9)-a(12) from Michael S. Branicky, Aug 17 2024

STATUS

approved