A242202 Numbers n such that n*9^n - 1 is prime.

10, 58, 264, 1568, 4198, 24500

Offset

1,1

Links

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

Steven Harvey, Generalized Woodall Search

Mathematica

Select[Range[2000], PrimeQ[# 9^# - 1] &]

Prog

(Magma) [n: n in [0..2000] | IsPrime(n*9^n-1)];
(PARI) is(n)=ispseudoprime(n*9^n-1) \\ Charles R Greathouse IV, Jun 06 2017

Crossrefs

Cf. similar sequences listed in A242200.

Sequence in context: A189417 A060157 A055583 * A125320 A321112 A126730

Adjacent sequences: A242199 A242200 A242201 * A242203 A242204 A242205

Keyword

nonn,more

Author

Vincenzo Librandi, May 09 2014

Extensions

a(5)-a(6) from Harvey's list (see Links).

Status

approved