

A053350


Numbers k such that 267*2^k + 1 is prime.


1



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
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OFFSET

1,1


LINKS

Jeppe Stig Nielsen, Table of n, a(n) for n = 1..54
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^n1 (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: A236371 A333620 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
Terms moved from Data section to bfile, and more terms added to bfile by Jeppe Stig Nielsen, Mar 12 2020


STATUS

approved



