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 A020468 #19 Jul 04 2025 11:17:54
%S A020468 5,59,599,59999,95959,99559,599959,599999,995959,999599,999959,
%T A020468 5595559,5595599,5599999,5955959,5995999,5999599,9555599,9559999,
%U A020468 9595559,9955559,9995599,55555559,55559599,55595599,55599959,55959559,59999999,95559559
%N A020468 Primes that contain digits 5 and 9 only.
%H A020468 Jason Bard, <a href="/A020468/b020468.txt">Table of n, a(n) for n = 1..10000</a> (first 1000 terms from Vincenzo Librandi)
%t A020468 Flatten[Table[Select[FromDigits/@Tuples[{5,9},n],PrimeQ],{n,8}]] (* _Vincenzo Librandi_, Jul 27 2012 *)
%o A020468 (Magma) [p: p in PrimesUpTo(95559559 ) | Set(Intseq(p)) subset [5,9]]; // _Vincenzo Librandi_, Jul 27 2012
%Y A020468 Subsequence of A030096.
%K A020468 nonn,base
%O A020468 1,1
%A A020468 _David W. Wilson_