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 A023325 #18 Sep 08 2022 08:44:47 %S A023325 3,107,421,773,1567,1637,3793,4111,6961,12721,14107,17851,26267,26557, %T A023325 31327,33503,37003,42281,57947,60091,65423,67427,68447,75721,82223, %U A023325 82657,87877,96377,108107,111373,113171,122117,123887,125497,125887,127301 %N A023325 Primes that remain prime through 4 iterations of function f(x) = 9x + 4. %C A023325 Primes p such that 9*p+4, 81*p+40, 729*p+364 and 6561*p+3280 are also primes. - _Vincenzo Librandi_, Aug 04 2010 %H A023325 John Cerkan, <a href="/A023325/b023325.txt">Table of n, a(n) for n = 1..10000</a> %o A023325 (Magma) [n: n in [1..5000000] | IsPrime(n) and IsPrime(9*n+4) and IsPrime(81*n+40) and IsPrime(729*n+364) and IsPrime(6561*n+3280)] // _Vincenzo Librandi_, Aug 04 2010 %Y A023325 Subsequence of A023234, A023266, and A023297. %K A023325 nonn %O A023325 1,1 %A A023325 _David W. Wilson_