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 A023265 #21 Sep 08 2022 08:44:47 %S A023265 3,11,19,31,103,109,113,131,151,173,179,239,283,313,491,521,599,619, %T A023265 733,739,773,929,1019,1103,1361,1439,1481,1621,1709,1741,1831,1993, %U A023265 2083,2153,2293,2411,2549,2551,2593,2689,2741,2819,2843,2969,3001,3623,3931,4001 %N A023265 Primes that remain prime through 2 iterations of function f(x) = 9x + 2. %C A023265 Primes p such that 9*p+2 and 81*p+20 are also primes. - _Vincenzo Librandi_, Aug 04 2010 %H A023265 John Cerkan, <a href="/A023265/b023265.txt">Table of n, a(n) for n = 1..10000</a> %o A023265 (Magma) [n: n in [1..100000] | IsPrime(n) and IsPrime(9*n+2) and IsPrime(81*n+20)] // _Vincenzo Librandi_, Aug 04 2010 %Y A023265 Subsequence of A023233. %K A023265 nonn %O A023265 1,1 %A A023265 _David W. Wilson_