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A050583
Numbers n such that 115*2^n-1 is prime.
0
1, 3, 11, 13, 19, 21, 31, 49, 59, 69, 73, 115, 129, 397, 597, 623, 769, 1131, 4581, 6229, 13477, 20995, 24541, 31089, 48535, 57375, 87151, 98543, 267443, 357829
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..30.
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(115*2^n-1) \\
Charles R Greathouse IV
, Jun 13 2017
CROSSREFS
Sequence in context:
A045427
A373726
A115165
*
A045428
A338445
A191049
Adjacent sequences:
A050580
A050581
A050582
*
A050584
A050585
A050586
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 September 16 20:35 EDT 2024. Contains 375977 sequences. (Running on oeis4.)