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A302136 Numbers k such that 10*k^k - 9 is prime. 4
2, 4, 14, 80, 1133, 4120 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
10*1133^1133 - 9 is a probable prime.
a(6) > 3000. - Tyler NeSmith, May 15 2021
LINKS
PROG
(PARI) isok(k) = ispseudoprime(10*k^k - 9); \\ Altug Alkan, Apr 02 2018
CROSSREFS
Numbers k such that b*k^k - b + 1 is prime: A110931 (b=2), A302132 (b=3), A301521 (b=4), A302123 (b=6), A302133 (b=8), A302134 (b=9), this sequence (b=10).
Cf. A302137.
Sequence in context: A340909 A052856 A093462 * A371674 A181080 A166894
KEYWORD
nonn,more
AUTHOR
Seiichi Manyama, Apr 02 2018
EXTENSIONS
a(6) from Michael S. Branicky, Mar 28 2023
STATUS
approved

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Last modified June 23 18:37 EDT 2024. Contains 373653 sequences. (Running on oeis4.)