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A053358
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Numbers k such that 283*2^k + 1 is prime.
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0
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..10.
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
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MATHEMATICA
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Select[Range[5*10^3], PrimeQ[283*2^# + 1] &] (* G. C. Greubel, May 24 2018 *)
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PROG
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(PARI) is(n)=ispseudoprime(283*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017
(MAGMA) [n: n in [1..5000] | IsPrime(283*2^n+1)]; // G. C. Greubel, May 24 2018
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CROSSREFS
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Sequence in context: A126525 A230615 A230731 * A163667 A214944 A259455
Adjacent sequences: A053355 A053356 A053357 * A053359 A053360 A053361
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KEYWORD
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hard,nonn,more
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AUTHOR
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N. J. A. Sloane, Dec 29 1999
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EXTENSIONS
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a(8)-a(9) from the Ray Ballinger and Wilfrid Keller link by Robert Price, Dec 20 2018
a(10) from Jeppe Stig Nielsen, Jan 19 2020
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STATUS
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approved
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