A032494 - OEIS

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A032494

Numbers k such that 235*2^k+1 is prime.

1

2, 4, 8, 10, 12, 14, 20, 22, 24, 32, 56, 76, 84, 86, 92, 118, 164, 382, 604, 1148, 1900, 2440, 2554, 2798, 3160, 6092, 7142, 14044, 14782, 21056, 24852, 29084, 44252, 46022, 101318, 294216, 412366, 493738, 769740, 923728, 1206136, 1596836, 2023486, 3801284

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OFFSET

1,1

LINKS

Jeppe Stig Nielsen, Table of n, a(n) for n = 1..46

Ray Ballinger, Proth Search Page

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[1000], PrimeQ[235*2^# + 1] & ] (* Robert Price, Dec 19 2018 *)

PROG

(PARI) is(n)=ispseudoprime(235*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017

CROSSREFS

Sequence in context: A132190 A155037 A001770 * A125953 A373490 A308357

Adjacent sequences: A032491 A032492 A032493 * A032495 A032496 A032497

KEYWORD

nonn,hard

AUTHOR

N. J. A. Sloane.

EXTENSIONS

a(36)-a(42) from the Ray Ballinger and Wilfrid Keller link by Robert Price, Dec 19 2018

a(43) from Jeppe Stig Nielsen, May 31 2020

a(44) from Jeppe Stig Nielsen, Dec 21 2024

STATUS

approved