A323148 Numbers k such that 439*2^k+1 is prime.

6, 18, 34, 54, 58, 454, 538, 994, 1122, 3222, 6582, 8886, 14974, 53014, 127086, 499662, 1112314, 1288818, 1408326, 3318318, 3773958

Offset

1,1

Links

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

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(k->isprime(439*2^k+1), [$1..1000]); # Muniru A Asiru, Jan 05 2019

Mathematica

Select[Range[1000], PrimeQ[439*2^# + 1] &]

Crossrefs

Sequence in context: A153126 A110671 A134078 * A181510 A301715 A269755

Adjacent sequences: A323145 A323146 A323147 * A323149 A323150 A323151

Keyword

nonn,more,hard

Author

Robert Price, Jan 05 2019

Extensions

a(20)-a(21) from Jeppe Stig Nielsen, Dec 18 2024

Status

approved