login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A323042 Numbers k such that 395*2^k+1 is prime. 0
5, 11, 23, 41, 221, 485, 839, 3029, 6479, 15455, 16715, 38399, 38525, 38645, 167501, 185571, 505679, 649445, 764369, 797849, 1106091, 1309751, 1447971, 1480715, 1538975 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..25.

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[395*2^# + 1] &] (* Robert Price, Jan 03 2019 *)

CROSSREFS

Sequence in context: A046628 A262284 A118439 * A210731 A295959 A156109

Adjacent sequences:  A323039 A323040 A323041 * A323043 A323044 A323045

KEYWORD

nonn,more,hard

AUTHOR

Robert Price, Jan 03 2019

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 October 14 08:54 EDT 2019. Contains 327995 sequences. (Running on oeis4.)