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A050890
Numbers k such that 263*2^k-1 is prime.
0
2, 6, 26, 114, 134, 180, 542, 882, 936, 2382, 3702, 5082, 6722, 15590, 19910, 26964, 29148, 48062, 54870, 69642, 73788, 79922, 95460, 215712
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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(263*2^n-1) \\
Charles R Greathouse IV
, Jun 13 2017
CROSSREFS
Sequence in context:
A282618
A192435
A296217
*
A114710
A230245
A358107
Adjacent sequences:
A050887
A050888
A050889
*
A050891
A050892
A050893
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
