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 A024909 #19 Sep 08 2022 08:44:48 %S A024909 1,3,5,7,13,15,17,19,27,29,33,35,39,43,45,47,55,57,63,67,69,73,83,85, %T A024909 89,99,105,109,113,115,117,123,133,137,143,145,147,153,157,159,165, %U A024909 167,173,175,179,189,193,199,203,209,213,215,217,223,227,235,237,249,253,257,265,267 %N A024909 Numbers k such that 9*k - 4 is prime. %H A024909 Vincenzo Librandi, <a href="/A024909/b024909.txt">Table of n, a(n) for n = 1..1000</a> %t A024909 Select[Range[400], PrimeQ[9# - 4] &] (* _Vincenzo Librandi_, Sep 26 2012 *) %o A024909 (Magma) [n: n in [1..300] | IsPrime(9*n-4)]; // _Vincenzo Librandi_, Nov 19 2010 %o A024909 (PARI) is(n)=isprime(9*n-4) \\ _Charles R Greathouse IV_, Jun 06 2017 %Y A024909 Cf. A061240 (associated primes). %K A024909 nonn,easy %O A024909 1,2 %A A024909 _Clark Kimberling_