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A050847
Numbers n such that 191*2^n-1 is prime.
0
226, 3594, 59770, 240802
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OFFSET
1,1
LINKS
Table of n, a(n) for n=1..4.
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(191*2^n-1) \\
Charles R Greathouse IV
, Jun 13 2017
CROSSREFS
Sequence in context:
A251395
A251507
A251500
*
A098247
A092994
A031513
Adjacent sequences:
A050844
A050845
A050846
*
A050848
A050849
A050850
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 August 21 12:27 EDT 2024. Contains 375353 sequences. (Running on oeis4.)