A367560 Numbers k such that k^7*2^k + 1 is a prime.

1, 3, 11, 51, 76, 123, 149, 274, 311, 328, 381, 639, 737, 898, 1156, 9017, 13200, 18348, 26388, 30081

Offset: 1

Author

Juri-Stepan Gerasimov, Nov 22 2023

Keywords

• nonn
• more

Comments

No further terms <= 100000. - Michael S. Branicky, Aug 28 2024

Crossrefs

Numbers k such that k^m*2^k + 1 is a prime: 0, 1, 2, 4, 8, 16, .. (m = 0), A005849 (m = 1), A058780 (m = 2), A357612 (m = 3), A366422 (m = 4), A367421 (m = 5), A367287 (m = 6), this sequence (m = 7).

Cf. A092506.

Programs

Magma

[k: k in [1..2000] | IsPrime(k^7*2^k+1)];

Extensions

a(18)-a(20) from Michael S. Branicky, Nov 22 2023