A098883 Numbers k such that (2^31-1)*(6^k) - 1 is prime.

27, 35, 69, 331, 589, 807, 1641, 1801, 2057, 2411, 4443, 4889, 4999, 5975, 11935

Offset

1,1

Comments

a(15) > 9500. - Jinyuan Wang, Mar 19 2020

Links

Table of n, a(n) for n=1..15.

Mathematica

With[{c=2^31-1}, Select[Range[2500], PrimeQ[c 6^#-1]&]] (* Harvey P. Dale, Oct 22 2011 *)

Prog

(PARI) is(n)=ispseudoprime((2^31-1)*(6^n)-1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A025583 A134101 A226191 * A326893 A160119 A160379

Adjacent sequences: A098880 A098881 A098882 * A098884 A098885 A098886

Keyword

nonn,more

Author

Pierre CAMI, Oct 14 2004

Extensions

a(11)-a(14) from Jinyuan Wang, Mar 19 2020

a(15) from Michael S. Branicky, Apr 21 2023

Status

approved