A166560 Primes of the form 100*n+9.

109, 409, 509, 709, 809, 1009, 1109, 1409, 1609, 1709, 2309, 2609, 2909, 3109, 3209, 3709, 4409, 4909, 5009, 5209, 5309, 6709, 7109, 7309, 8009, 8209, 8609, 9109, 9209, 10009, 10709, 10909, 11909, 12109, 12409, 12809, 13009, 13109, 13309, 13709

Offset: 1

Author

Vincenzo Librandi, Oct 25 2009

Keywords

• nonn
• easy

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A104045.

Programs

Magma

[a: n in [0..250] | IsPrime(a) where a is 100*n+9]; // Vincenzo Librandi, Jul 25 2012

Mathematica

Select[Table[100 n + 9, {n, 0, 700}], PrimeQ] (* Vincenzo Librandi, Jul 25 2012 *)

Formula

a(n) = 9 + 10 * A104045(n). - Alois P. Heinz, Jan 19 2024