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A050881 Numbers n such that 245*2^n-1 is prime. 0
4, 6, 28, 76, 96, 124, 294, 396, 726, 868, 928, 1400, 3056, 6594, 12588, 15708, 88576, 144288, 238468 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Also in the sequence: 606706, 619938 - Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008
LINKS
Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for k < 300
PROG
(PARI) is(n)=ispseudoprime(245*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A066293 A204385 A341045 * A229719 A122113 A093815
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 12:26 EDT 2024. Contains 371254 sequences. (Running on oeis4.)