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A367037
Numbers k such that k^3*2^k - 1 is a prime.
5
2, 8, 31, 79, 661, 769, 1904, 2527, 9032, 15895, 19171
OFFSET
1,1
COMMENTS
If it exists, a(12) > 100000. - Hugo Pfoertner, Nov 03 2023
MATHEMATICA
Select[Range[3000], PrimeQ[#^3*2^# - 1] &] (* Amiram Eldar, Nov 04 2023 *)
PROG
(Magma) [k: k in [1..700] | IsPrime(k^3*2^k-1)];
CROSSREFS
Numbers k such that k^m*2^k - 1 is prime: A000043 (m = 0), A002234 (m = 1), A058781 (m = 2), this sequence (m = 3).
Sequence in context: A265950 A359117 A294264 * A007468 A280156 A054137
KEYWORD
nonn,more
AUTHOR
EXTENSIONS
a(11) from Hugo Pfoertner, Nov 02 2023
STATUS
approved