A300292 Numbers k such that k^k + 9 is a prime.

2, 130, 140

Offset: 1

Author

Seiichi Manyama, Mar 16 2018

Keywords

• nonn
• hard
• more
• bref

Comments

No more terms <= 7000. - Jon E. Schoenfield, Mar 16 2018

No more terms <= 30000. - Michael S. Branicky, Sep 02 2024

Crossrefs

Numbers k such that k^k + b is a prime: A300981 (b=-10), A300976 (b=-5), A100408 (b=-2), A100407 (b=2), A166852 (b=3), A100837 (b=4), A100838 (b=7), this sequence (b=9), A100839 (b=10), A173974 (b=43).

Cf. A074966.

Programs

PARI

isok(k) = ispseudoprime(k^k + 9); \\ Altug Alkan, Mar 16 2018