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A050868 Numbers n such that 233*2^n-1 is prime. 0
4, 10, 12, 22, 24, 34, 48, 60, 100, 562, 574, 640, 838, 852, 2002, 4198, 4932, 5860, 10492, 13834, 17398, 25944, 133030, 179992 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..24.

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

Kosmaj, Riesel list k<300.

PROG

(PARI) is(n)=ispseudoprime(233*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017

CROSSREFS

Sequence in context: A310346 A080285 A138628 * A007319 A175436 A074939

Adjacent sequences:  A050865 A050866 A050867 * A050869 A050870 A050871

KEYWORD

hard,nonn

AUTHOR

N. J. A. Sloane, Dec 29 1999

EXTENSIONS

More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008

STATUS

approved

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Last modified November 15 14:32 EST 2018. Contains 317239 sequences. (Running on oeis4.)