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A050577
Numbers n such that 103*2^n-1 is prime.
0
3, 7, 11, 19, 63, 75, 95, 127, 155, 163, 171, 283, 563, 1739, 2243, 3971, 4375, 5227, 8307, 9943, 18383, 19835, 25879, 26927, 36895, 304771, 422939
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OFFSET
1,1
LINKS
Table of n, a(n) for n=1..27.
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(103*2^n-1) \\
Charles R Greathouse IV
, Jun 13 2017
CROSSREFS
Sequence in context:
A284027
A111056
A083908
*
A283178
A284298
A178881
Adjacent sequences:
A050574
A050575
A050576
*
A050578
A050579
A050580
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.)