A322954 Numbers k such that 323*2^k+1 is prime.

1, 5, 145, 329, 381, 465, 3121, 4201, 4309, 12669, 13601, 17221, 33601, 41741, 46921, 65745, 80269, 384685, 1072285, 3482789

Offset

1,2

Links

Table of n, a(n) for n=1..20.

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(323*2^n+1), [$1..1000]); # Muniru A Asiru, Dec 31 2018

Mathematica

Select[Range[1000], PrimeQ[323*2^# + 1] &] (* Robert Price, Dec 31 2018 *)

Crossrefs

Cf. A002255, A050527.

Sequence in context: A168041 A081322 A232986 * A254711 A273920 A076218

Adjacent sequences: A322951 A322952 A322953 * A322955 A322956 A322957

Keyword

nonn,more,hard,changed

Author

Robert Price, Dec 31 2018

Extensions

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

Status

approved