login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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 (list; graph; refs; listen; history; text; internal format)
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^n-1 (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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 19 03:54 EST 2020. Contains 332032 sequences. (Running on oeis4.)