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

 

Logo

Please make a donation to keep the OEIS running. We are now in our 56th year. In the past year we added 10000 new sequences and reached almost 9000 citations (which often say "discovered thanks to the OEIS").
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A323005 Numbers k such that 361*2^k+1 is prime. 0
28, 36, 100, 312, 568, 2584, 9144, 37284, 96720, 105132, 147084, 222292, 280728, 292600, 1459308, 2312832, 2424232 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..17.

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

MATHEMATICA

Select[Range[1000], PrimeQ[361*2^# + 1] &] (* Robert Price, Jan 01 2019 *)

CROSSREFS

Sequence in context: A048023 A105710 A192226 * A080983 A179105 A096430

Adjacent sequences:  A323002 A323003 A323004 * A323006 A323007 A323008

KEYWORD

nonn,more,hard

AUTHOR

Robert Price, Jan 01 2019

EXTENSIONS

a(16)-a(17) 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 December 2 01:48 EST 2020. Contains 338864 sequences. (Running on oeis4.)