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A367561
Numbers k such that k^7*2^k - 1 is a prime.
1
6, 45, 55, 80, 135, 187, 205, 384, 405, 1291, 1364, 2301, 2486, 2844, 16892, 27308, 30152, 32535, 45324, 71522, 72865
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OFFSET
1,1
COMMENTS
No further terms <= 100000. -
Michael S. Branicky
, Aug 28 2024
LINKS
Table of n, a(n) for n=1..21.
MATHEMATICA
Select[Range[3000], PrimeQ[#^7*2^# - 1] &] (*
Amiram Eldar
, Nov 23 2023 *)
PROG
(Magma) [k: k in [1..4000] | IsPrime(k^7*2^k-1)];
CROSSREFS
Numbers k such that k^m*2^k - 1 is a prime:
A000043
(m = 0),
A002234
(m = 1),
A058781
(m = 2),
A367037
(m = 3),
A367102
(m = 4),
A367464
(m = 5),
A367478
(m = 6), this sequence (m = 7).
Cf.
A367560
.
Sequence in context:
A158460
A077672
A119202
*
A286325
A335387
A063947
Adjacent sequences:
A367558
A367559
A367560
*
A367562
A367563
A367564
KEYWORD
nonn
,
more
AUTHOR
Juri-Stepan Gerasimov
, Nov 22 2023
EXTENSIONS
a(16)-a(21) from
Michael S. Branicky
, Nov 23 2023
STATUS
approved
