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 A284382 #16 Jun 25 2025 14:49:40
%S A284382 5,9,55,59,95,99,555,559,595,599,955,959,995,999,5555,5559,5595,5599,
%T A284382 5955,5959,5995,5999,9555,9559,9595,9599,9955,9959,9995,9999,55555,
%U A284382 55559,55595,55599,55955,55959,55995,55999,59555,59559,59595,59599,59955,59959
%N A284382 Numbers k with digits 5 and 9 only.
%C A284382 Prime terms are in A020468.
%H A284382 Michael S. Branicky, <a href="/A284382/b284382.txt">Table of n, a(n) for n = 1..10000</a>
%t A284382 Join @@ ((FromDigits /@ Tuples[{5, 9}, #]) & /@ Range@ 5) (* _Giovanni Resta_, Mar 28 2017 *)
%o A284382 (Magma) [n: n in [1..100000] | Set(IntegerToSequence(n, 10)) subset {5, 9}];
%o A284382 (Python)
%o A284382 def a(n): return int(bin(n+1)[3:].replace('0', '5').replace('1', '9'))
%o A284382 print([a(n) for n in range(1, 45)]) # _Michael S. Branicky_, May 09 2021
%Y A284382 Numbers n with digits 5 and k only for k = 0 - 4 and 6 - 9: A169964 (k = 0), A276037 (k = 1), A072961 (k = 2), A284379 (k = 3), A256290 (k = 4), A256291 (k = 6), A284380 (k = 7), A284381 (k = 8), this sequence (k = 9).
%K A284382 nonn,base
%O A284382 1,1
%A A284382 _Jaroslav Krizek_, Mar 28 2017