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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A053350 Numbers k such that 267*2^k + 1 is prime. 0
2, 3, 4, 12, 34, 40, 46, 70, 82, 102, 118, 119, 192, 202, 300, 434, 508, 515, 516, 612, 690, 718, 795, 846, 1112, 1786, 3884, 5112, 5136, 8628, 10218, 10222, 16415, 38796, 40642, 47318, 48134, 48634, 50778, 60134, 60282, 88088, 240778, 314228, 331154, 383172, 388655, 556486, 754570, 1053203, 1876604 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..51.

Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for k < 300

Wilfrid Keller, List of primes k.2^n - 1 for k < 300

Index entries for sequences of n such that k*2^n-1 (or k*2^n+1) is prime

MATHEMATICA

Select[Range[5*10^3], PrimeQ[267*2^# + 1] &] (* G. C. Greubel, May 24 2018 *)

PROG

(PARI) is(n)=ispseudoprime(267*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017

(MAGMA) [n: n in [1..300] | IsPrime(267*2^n+1)];  // G. C. Greubel, May 24 2018

CROSSREFS

Sequence in context: A168047 A236371 A173446 * A165302 A276530 A251411

Adjacent sequences:  A053347 A053348 A053349 * A053351 A053352 A053353

KEYWORD

hard,nonn

AUTHOR

N. J. A. Sloane, Dec 29 1999

EXTENSIONS

a(43)-a(51) from the Ray Ballinger and Wilfrid Keller link by Robert Price, Dec 20 2018

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 August 24 03:51 EDT 2019. Contains 326260 sequences. (Running on oeis4.)