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A098856
Numbers k such that 4^k*(2^k - 1) + 1 is a prime.
2
1, 3, 19, 34, 51, 318, 3670, 6348, 33292, 48582, 50235, 50964
OFFSET
1,2
COMMENTS
a(9) > 11500. - Jinyuan Wang, Mar 19 2020
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).
Sequence in context: A360081 A061427 A069516 * A178201 A062291 A106082
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