A098126 Numbers k such that (2^127-1)*2^k + 1 is prime.

38, 58, 64, 144, 198, 324, 950, 1230, 1934, 4662, 7644, 9060, 10852, 11082, 13740, 16682, 24502, 27574, 54940, 66710, 84402

Offset

1,1

Comments

a(17) > 22800. - Jinyuan Wang, Mar 19 2020

a(19) > 30000. - Tyler NeSmith, Apr 12 2022

Links

Table of n, a(n) for n=1..21.

Prog

(PARI) is(n)=ispseudoprime((2^127-1)*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A077801 A078544 A116243 * A244313 A147616 A193568

Adjacent sequences: A098123 A098124 A098125 * A098127 A098128 A098129

Keyword

nonn,more

Author

Pierre CAMI, Sep 25 2004

Extensions

a(15)-a(16) from Jinyuan Wang, Mar 19 2020

a(17)-a(18) from Tyler NeSmith, Apr 12 2022

a(19)-a(20) from Michael S. Branicky, Apr 22 2023

a(21) from Michael S. Branicky, Jul 23 2024

Status

approved