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A050574
Numbers n such that 97*2^n-1 is prime.
0
1, 9, 45, 177, 585, 1409, 2617, 3465, 6981, 843205
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..10.
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(97*2^n-1) \\
Charles R Greathouse IV
, Jun 13 2017
CROSSREFS
Sequence in context:
A036826
A022574
A321948
*
A124647
A111640
A024209
Adjacent sequences:
A050571
A050572
A050573
*
A050575
A050576
A050577
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 17 07:15 EDT 2024. Contains 375200 sequences. (Running on oeis4.)