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

Author

Vincenzo Librandi, Jun 15 2015

Keywords

• nonn
• more

Comments

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

Examples

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

Crossrefs

Cf. similar sequences listed in A258932.

Programs

Magma

[n: n in [1..400] | IsPrime(10^n+109)];

Mathematica

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

PARI

is(n)=ispseudoprime(10^n+109) \\ Charles R Greathouse IV, Jun 13 2017

Extensions

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