A323147 Numbers k such that 437*2^k+1 is prime.

23, 83, 467, 2267, 64835, 105599, 2769299, 2803775

Offset

1,1

Links

Table of n, a(n) for n=1..8.

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(437*2^k+1), [$1..3000]); # Muniru A Asiru, Jan 05 2019

Mathematica

Select[Range[1000], PrimeQ[437*2^# + 1] &]

Crossrefs

Sequence in context: A142790 A288340 A316378 * A262119 A104068 A304839

Adjacent sequences: A323144 A323145 A323146 * A323148 A323149 A323150

Keyword

nonn,more,hard

Author

Robert Price, Jan 05 2019

Extensions

a(7)-a(8) from Jeppe Stig Nielsen, Dec 27 2019

Status

approved