A367464 Numbers k such that k^5*2^k - 1 is a prime.

2, 6, 9, 18, 42, 132, 139, 482, 523, 524, 859, 909, 948, 979, 1158, 1741, 2364, 3519, 4388, 5952, 6266, 8564, 12169, 14448, 54944

Offset

1,1

Links

Table of n, a(n) for n=1..25.

Mathematica

Select[Range[2500], PrimeQ[#^5*2^# - 1] &] (* Amiram Eldar, Nov 19 2023 *)

Prog

(Magma) [k: k in [1..1000] | IsPrime(k^5*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), this sequence (m = 5).

Cf. A367421.

Sequence in context: A222048 A156190 A285446 * A076738 A291100 A361271

Adjacent sequences: A367461 A367462 A367463 * A367465 A367466 A367467

Keyword

nonn,more

Author

Juri-Stepan Gerasimov, Nov 18 2023

Extensions

a(24)-a(25) from Michael S. Branicky, Nov 18 2023

Status

approved