A217493 Numbers k such that 9^k - 10 is prime.

2, 3, 4, 9, 11, 18, 19, 27, 28, 46, 50, 53, 80, 155, 203, 280, 451, 4963, 6167, 9687, 10083, 31450

Offset

1,1

Comments

Contains exactly the halved even terms of A217347.

Links

Table of n, a(n) for n=1..22.

Mathematica

Select[Range[5000], PrimeQ[9^# - 10] &]

Prog

(PARI) is(n)=ispseudoprime(9^n-10) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Cf. A217137, A217347.

Sequence in context: A093514 A215810 A080231 * A368349 A125774 A062410

Adjacent sequences: A217490 A217491 A217492 * A217494 A217495 A217496

Keyword

nonn,more

Author

Vincenzo Librandi, Oct 05 2012

Extensions

a(19)-a(22) added from the data at A217347 by Amiram Eldar, Jun 19 2022

Status

approved