A253968 Numbers n such that (23*10^n - 26)/6 is prime.

2, 4, 6, 10, 11, 18, 29, 151, 920, 1456, 1716, 1915, 4148, 4403, 8005, 9600, 41945, 47238

Offset

1,1

Links

Table of n, a(n) for n=1..18.

Example

n = 2, 4, and 6, yield (23*10^n - 26)/6 = 379, 38329, and 3833329, respectively, which are prime.

Mathematica

fQ[n_] := PrimeQ[(23*10^n - 26)/6]; Select[ Range@ 10000, fQ] (* Robert G. Wilson v, Jan 28 2015 *)

Prog

(PARI) is(n)=ispseudoprime((23*10^n-26)/6) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Cf. A254005.

Sequence in context: A027435 A014666 A067852 * A102025 A309374 A226295

Adjacent sequences: A253965 A253966 A253967 * A253969 A253970 A253971

Keyword

nonn,more

Author

Hans Havermann, Jan 24 2015

Status

approved