A322951 Numbers k such that 319*2^k+1 is prime.

2, 10, 18, 274, 314, 522, 562, 578, 594, 602, 930, 1074, 23826, 184554, 1923378, 2248914, 2290722, 3069362

Offset

1,1

Links

Table of n, a(n) for n=1..18.

Ray Ballinger, Proth Search Page

Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for 300 < k < 600

Y. Gallot, Proth.exe: Windows Program for Finding Large Primes

Wilfrid Keller, List of primes k.2^n - 1 for k < 300

Eric Weisstein's World of Mathematics, Proth Prime

Index entries for sequences of n such that k*2^n-1 (or k*2^n+1) is prime

Maple

select(n->isprime(319*2^n+1), [$1..1000]); # Muniru A Asiru, Dec 31 2018

Mathematica

Select[Range[1000], PrimeQ[319*2^# + 1] &] (* Robert Price, Dec 31 2018 *)

Crossrefs

Cf. A002255, A050527.

Sequence in context: A346551 A180591 A330083 * A156446 A032685 A085936

Adjacent sequences: A322948 A322949 A322950 * A322952 A322953 A322954

Keyword

nonn,more,hard

Author

Robert Price, Dec 31 2018

Extensions

a(16)-a(17) from Jeppe Stig Nielsen, Feb 25 2020

a(18) from Jeppe Stig Nielsen, Dec 20 2024

Status

approved