This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A049510 #19 Mar 01 2021 07:43:54 %S A049510 8,10,17,22,24,29,34,35,41,46,50,52,57,70,72,75,77,80,81,85,87,92,95, %T A049510 97,104,109,114,120,127,128,131,136,140,145,146,149,157,158,169,171, %U A049510 175,176,180,186,189,201,204,205,207,209,215,222,223,226,228,232,237,239 %N A049510 Numbers k such that prime(k) == 9 (mod 10). %C A049510 The asymptotic density of this sequence is 1/4 (by Dirichlet's theorem). - _Amiram Eldar_, Mar 01 2021 %F A049510 a(n) = A000720(A030433(n)). - _Ray Chandler_, Nov 07 2006 %t A049510 Select[Range[240], Mod[Prime[ # ], 10] == 9 &] (* _Ray Chandler_, Nov 07 2006 *) %Y A049510 Cf. A000720, A030433, A102700. %Y A049510 Cf. A049508, A049509, A049511. %K A049510 nonn %O A049510 1,1 %A A049510 _N. J. A. Sloane_ %E A049510 Extended by _Ray Chandler_, Nov 07 2006