A302136 - OEIS

A302136

Numbers k such that 10*k^k - 9 is prime.

2, 4, 14, 80, 1133, 4120

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OFFSET

1,1

COMMENTS

10*1133^1133 - 9 is a probable prime.

a(6) > 3000. - Tyler NeSmith, May 15 2021

a(7) > 20000. - Michael S. Branicky, Nov 29 2024

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).

KEYWORD

nonn,more

AUTHOR

EXTENSIONS

a(6) from Michael S. Branicky, Mar 28 2023

STATUS

approved