A258933 Numbers k such that 10^k + 109 is prime.

3, 5, 41, 357, 395, 479, 645, 2637, 8853, 11529, 20087, 27443, 30635

Offset

1,1

Comments

a(14) > 50000. - Michael S. Branicky, Oct 13 2024

Links

Table of n, a(n) for n=1..13.

Example

For n = 3, a(3) = 10^3 + 109 = 1109, which is prime.

Mathematica

Select[Range[3000], PrimeQ[10^# + 109] &]

Prog

(Magma) [n: n in [1..400] | IsPrime(10^n+109)];
(PARI) is(n)=ispseudoprime(10^n+109) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Cf. similar sequences listed in A258932.

Sequence in context: A096058 A120265 A158328 * A060433 A216085 A219018

Adjacent sequences: A258930 A258931 A258932 * A258934 A258935 A258936

Keyword

nonn,more

Author

Vincenzo Librandi, Jun 15 2015

Extensions

a(9)-a(13) from Jens Kruse Andersen, Jun 23 2015

Status

approved