A302136 Numbers k such that 10*k^k - 9 is prime.

2, 4, 14, 80, 1133, 4120

Offset

1,1

Comments

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

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

Links

Table of n, a(n) for n=1..6.

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 * A181080 A166894 A232108

Adjacent sequences: A302133 A302134 A302135 * A302137 A302138 A302139

Keyword

nonn,more

Author

Seiichi Manyama, Apr 02 2018

Extensions

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

Status

approved