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A050588
Numbers n such that 125*2^n-1 is prime.
0
2, 4, 44, 182, 496, 904, 1196, 3034, 4004, 5474, 18122, 21952, 24874, 27614, 31166, 35386, 44234, 51104, 96346, 100966, 109454, 123634, 388934, 418034, 659314, 918494
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OFFSET
1,1
LINKS
Table of n, a(n) for n=1..26.
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(125*2^n-1) \\
Charles R Greathouse IV
, Jun 13 2017
CROSSREFS
Sequence in context:
A141142
A353797
A007596
*
A217795
A105282
A348247
Adjacent sequences:
A050585
A050586
A050587
*
A050589
A050590
A050591
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 June 29 06:14 EDT 2024. Contains 373826 sequences. (Running on oeis4.)