A049510 Numbers k such that prime(k) == 9 (mod 10).

8, 10, 17, 22, 24, 29, 34, 35, 41, 46, 50, 52, 57, 70, 72, 75, 77, 80, 81, 85, 87, 92, 95, 97, 104, 109, 114, 120, 127, 128, 131, 136, 140, 145, 146, 149, 157, 158, 169, 171, 175, 176, 180, 186, 189, 201, 204, 205, 207, 209, 215, 222, 223, 226, 228, 232, 237, 239

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn

Comments

The asymptotic density of this sequence is 1/4 (by Dirichlet's theorem). - Amiram Eldar, Mar 01 2021

Crossrefs

Cf. A000720, A030433, A102700.

Cf. A049508, A049509, A049511.

Programs

Mathematica

Select[Range[240], Mod[Prime[ # ], 10] == 9 &] (* Ray Chandler, Nov 07 2006 *)

Formula

a(n) = A000720(A030433(n)). - Ray Chandler, Nov 07 2006

Extensions

Extended by Ray Chandler, Nov 07 2006