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 A023321 #18 Sep 08 2022 08:44:47 %S A023321 8431,9721,24169,35311,63577,74203,109471,109891,140269,174613,176599, %T A023321 182857,210187,241561,270553,274837,274909,276517,281557,324763, %U A023321 326737,383659,464089,474127,489109,498403,540781,563587,576943,582949,633253 %N A023321 Primes that remain prime through 4 iterations of function f(x) = 8x + 5. %C A023321 Primes p such that 8*p+5, 64*p+45, 512*p+365 and 4096*p+2925 are also primes. - _Vincenzo Librandi_, Aug 04 2010 %H A023321 John Cerkan, <a href="/A023321/b023321.txt">Table of n, a(n) for n = 1..10000</a> %F A023321 a(n) == 19 or 31 (mod 42). - _John Cerkan_, Oct 08 2016 %o A023321 (Magma) [n: n in [1..5000000] | IsPrime(n) and IsPrime(8*n+5) and IsPrime(64*n+45) and IsPrime(512*n+365) and IsPrime(4096*n+2925)] // _Vincenzo Librandi_, Aug 04 2010 %Y A023321 Subsequence of A023230, A023262, A023293, and A105133. %K A023321 nonn %O A023321 1,1 %A A023321 _David W. Wilson_