

A323145


Numbers k such that 433*2^k+1 is prime.


0



2, 8, 32, 38, 46, 58, 92, 212, 242, 332, 494, 1088, 3428, 39758, 58214, 70196, 101474, 2109146, 2188076, 2348252
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OFFSET

1,1


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^n1 (or k*2^n+1) is prime


MAPLE

select(k>isprime(433*2^k+1), [$1..1000]); # Muniru A Asiru, Jan 05 2019


MATHEMATICA

Select[Range[1000], PrimeQ[433*2^# + 1] &]


CROSSREFS

Sequence in context: A264572 A279692 A332444 * A071387 A200063 A238984
Adjacent sequences: A323142 A323143 A323144 * A323146 A323147 A323148


KEYWORD

nonn,more,hard


AUTHOR

Robert Price, Jan 05 2019


EXTENSIONS

a(18)a(20) from Jeppe Stig Nielsen, Jan 04 2020


STATUS

approved



