A384456 Positive integers k such that (2^k - 1)^k + 2 is prime.

1, 2, 4, 8, 16, 40

Offset: 1

Author

Thomas Ordowski, May 30 2025

Keywords

• nonn
• more

Comments

If it exists, a(7) > 800. - Hugo Pfoertner, Jun 03 2025

Crossrefs

Cf. A019434.

Programs

Mathematica

Select[Range[100],PrimeQ[(2^#-1)^#+2] &] (* Stefano Spezia, Jun 01 2025 *)

PARI

isok(k) = ispseudoprime((2^k - 1)^k + 2); \\ Michel Marcus, May 30 2025