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 A090613 #9 Mar 01 2021 06:16:22 %S A090613 2,7,11,17,21,26,37,46,49,53,57,61,64,71,73,80,92,98,103,106,114,118, %T A090613 121,137,138,145,148,160,166,168,175,186,188,190,196,204,206,210,215, %U A090613 218,232,236,243,248,255,258,263,265,273,281,289,292,296,316,321,334 %N A090613 Numbers k such that the k-th prime is congruent to 3 mod 7. %C A090613 Also numbers k such that the k-th prime is congruent to 3 mod 14. %C A090613 A045437 indexed by A000040. %C A090613 The asymptotic density of this sequence is 1/6 (by Dirichlet's theorem). - _Amiram Eldar_, Mar 01 2021 %F A090613 a(n) = k such that A000040(k) = A045437(n). %t A090613 Select[Range[350], Mod[Prime[#], 7] == 3 &] (* _Amiram Eldar_, Mar 01 2021 *) %Y A090613 Cf. A024903, A033868, A045437, A089033, A090614. %K A090613 nonn %O A090613 1,1 %A A090613 _Ray Chandler_, Dec 23 2003 %E A090613 Offset corrected by _Amiram Eldar_, Mar 01 2021