A300981 -id:A300981 - cp's OEIS frontend

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

2, 130, 140

Offset: 1

Seiichi Manyama, Mar 16 2018

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

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

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.

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

A300976 Numbers k such that k^k - 5 is a prime.

Original entry on oeis.org

4, 104, 124, 728

Offset: 1

Seiichi Manyama, Mar 17 2018

728^728 - 5 is a probable prime.
Next term, if it exists, is greater than 5000. - Vaclav Kotesovec, Mar 25 2018
Next term, if it exists, is greater than 31000. - Robert Price, Mar 26 2018

Numbers k such that k^k + b is a prime: A300981 (b=-10), this sequence (b=-5), A100408 (b=-2), A100407 (b=2), A166852 (b=3), A100837 (b=4), A100838 (b=7), A300292 (b=9), A100839 (b=10), A173974 (b=43).

Select[Range[1000], PrimeQ[#^# - 5] &] (* Vaclav Kotesovec, Mar 25 2018 *)

isok(k) = ispseudoprime(k^k - 5); \\ Altug Alkan, Mar 17 2018

cp's OEIS Frontend

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

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