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 A049510 Numbers k such that prime(k) == 9 (mod 10). 5

%I

%S 8,10,17,22,24,29,34,35,41,46,50,52,57,70,72,75,77,80,81,85,87,92,95,

%T 97,104,109,114,120,127,128,131,136,140,145,146,149,157,158,169,171,

%U 175,176,180,186,189,201,204,205,207,209,215,222,223,226,228,232,237,239

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

%C The asymptotic density of this sequence is 1/4 (by Dirichlet's theorem). - _Amiram Eldar_, Mar 01 2021

%F a(n) = A000720(A030433(n)). - _Ray Chandler_, Nov 07 2006

%t Select[Range[240], Mod[Prime[ # ], 10] == 9 &] (* _Ray Chandler_, Nov 07 2006 *)

%Y Cf. A000720, A030433, A102700.

%Y Cf. A049508, A049509, A049511.

%K nonn

%O 1,1

%A _N. J. A. Sloane_

%E Extended by _Ray Chandler_, Nov 07 2006

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Last modified June 21 05:34 EDT 2021. Contains 345355 sequences. (Running on oeis4.)