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 A023297 #22 Aug 28 2024 14:46:12 %S A023297 3,31,37,41,107,421,773,967,1451,1567,1571,1637,1973,3011,3793,4111, %T A023297 4217,4703,5783,6961,7331,8443,8627,9323,10733,12071,12413,12721, %U A023297 12967,13523,14107,14503,14737,15647,17851,17881,19853,19991,20051,20233,22157,23291 %N A023297 Primes that remain prime through 3 iterations of function f(x) = 9x + 4. %C A023297 Primes p such that 9*p+4, 81*p+40 and 729*p+364 are also primes. - _Vincenzo Librandi_, Aug 04 2010 %H A023297 John Cerkan, <a href="/A023297/b023297.txt">Table of n, a(n) for n = 1..10000</a> %o A023297 (Magma) [n: n in [1..450000] | IsPrime(n) and IsPrime(9*n+4) and IsPrime(81*n+40) and IsPrime(729*n+364)]; // _Vincenzo Librandi_, Aug 04 2010 %Y A023297 Subsequence of A023234 and A023266. %K A023297 nonn %O A023297 1,1 %A A023297 _David W. Wilson_