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%I #19 Mar 01 2021 07:43:54
%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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