

A053360


Numbers k such that 287*2^k + 1 is a prime.


0



3, 27, 59, 291, 699, 1259, 1771, 3051, 19379, 23323, 41459, 121747, 206539, 515827
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OFFSET

1,1


LINKS

Table of n, a(n) for n=1..14.
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 a prime


MATHEMATICA

Select[Range[5*10^3], PrimeQ[287*2^# + 1] &] (* G. C. Greubel, May 25 2018 *)


PROG

(PARI) is(n)=ispseudoprime(287*2^n+1) \\ G. C. Greubel, May 25 2018
(MAGMA) [n: n in [1..300]  IsPrime(287*2^n+1)]; // G. C. Greubel, May 25 2018


CROSSREFS

Sequence in context: A071183 A025414 A201276 * A176963 A204046 A305094
Adjacent sequences: A053357 A053358 A053359 * A053361 A053362 A053363


KEYWORD

hard,nonn,more


AUTHOR

N. J. A. Sloane, Dec 29 1999


EXTENSIONS

a(12)a(14) from the Ray Ballinger and Wilfrid Keller link by Robert Price, Dec 22 2018


STATUS

approved



