login
Numbers k such that k^k + 9 is a prime.
2

%I #50 Sep 02 2024 10:41:43

%S 2,130,140

%N Numbers k such that k^k + 9 is a prime.

%C No more terms <= 7000. - _Jon E. Schoenfield_, Mar 16 2018

%C No more terms <= 30000. - _Michael S. Branicky_, Sep 02 2024

%o (PARI) isok(k) = ispseudoprime(k^k + 9); \\ _Altug Alkan_, Mar 16 2018

%Y 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).

%Y Cf. A074966.

%K nonn,hard,more,bref

%O 1,1

%A _Seiichi Manyama_, Mar 16 2018