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A300981
Numbers k such that k^k - 10 is a prime.
2
3, 9, 27, 249
OFFSET
1,1
COMMENTS
a(5), if it exists, is greater than 5000. - Vaclav Kotesovec, Mar 25 2018
a(5), if it exists, is greater than 25000. - Michael S. Branicky, Sep 02 2024
MATHEMATICA
Select[Range[1000], PrimeQ[#^# - 10] &] (* Vaclav Kotesovec, Mar 25 2018 *)
PROG
(PARI) isok(k) = ispseudoprime(k^k - 10); \\ Altug Alkan, Mar 17 2018
CROSSREFS
Numbers k such that k^k + b is a prime: this sequence (b=-10), A300976 (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).
Sequence in context: A143014 A202907 A032261 * A018924 A061582 A175129
KEYWORD
nonn,hard,more
AUTHOR
Seiichi Manyama, Mar 17 2018
STATUS
approved