A302133 Numbers k such that 8*k^k - 7 is prime.

10, 800, 1266, 1395

Offset: 1

Author

Seiichi Manyama, Apr 02 2018

Keywords

• nonn
• more

Comments

The terms greater than or equal to 800 correspond to probable primes.

a(5) > 4000. - Tyler NeSmith, May 13 2021

a(5) > 20000. - Michael S. Branicky, Sep 02 2024

Crossrefs

Numbers k such that b*k^k - b + 1 is prime: A110931 (b=2), A302132 (b=3), A301521 (b=4), A302123 (b=6), this sequence (b=8), A302134 (b=9), A302136 (b=10).

Programs

PARI

isok(k) = ispseudoprime(8*k^k - 7); \\ Altug Alkan, Apr 02 2018