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 A023264 #23 Sep 08 2022 08:44:47 %S A023264 23,43,83,109,193,379,389,569,643,659,853,1063,1129,1283,1423,1493, %T A023264 1759,1789,1889,2003,2129,2293,2459,2713,2729,2879,2969,3373,3823, %U A023264 4519,4603,4649,4663,4703,4783,4789,5023,5153,5209,5639,5653,5669,5693,5783,6203 %N A023264 Primes that remain prime through 2 iterations of function f(x) = 8x + 9. %C A023264 Primes p such that 8*p+9 and 64*p+81 are also primes. - _Vincenzo Librandi_, Aug 04 2010 %H A023264 John Cerkan, <a href="/A023264/b023264.txt">Table of n, a(n) for n = 1..10000</a> %F A023264 a(n) == 3 or 9 (mod 10). - _John Cerkan_, Sep 16 2016 %t A023264 Select[Prime[Range[1000]],AllTrue[Rest[NestList[8#+9&,#,2]],PrimeQ]&] (* The program uses the AllTrue function from Mathematica version 10 *) (* _Harvey P. Dale_, Sep 26 2016 *) %o A023264 (Magma) [n: n in [1..100000] | IsPrime(n) and IsPrime(8*n+9) and IsPrime(64*n+81)] // _Vincenzo Librandi_, Aug 04 2010 %Y A023264 Subsequence of A023232 and of A153762. %K A023264 nonn %O A023264 1,1 %A A023264 _David W. Wilson_