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A050878 Numbers n such that 239*2^n-1 is prime. 0
4, 92, 25780, 104956, 140116, 356300 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for k < 300
PROG
(PARI) is(n)=ispseudoprime(239*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A221287 A177411 A219891 * A173362 A353089 A202899
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 March 28 07:30 EDT 2024. Contains 371235 sequences. (Running on oeis4.)