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%I #12 Sep 08 2022 08:46:19
%S 5,9,55,59,95,99,555,559,595,599,955,959,995,999,5555,5559,5595,5599,
%T 5955,5959,5995,5999,9555,9559,9595,9599,9955,9959,9995,9999,55555,
%U 55559,55595,55599,55955,55959,55995,55999,59555,59559,59595,59599,59955,59959
%N Numbers n with digits 5 and 9 only.
%C Prime terms are in A020468.
%H Michael S. Branicky, <a href="/A284382/b284382.txt">Table of n, a(n) for n = 1..10000</a>
%t Join @@ ((FromDigits /@ Tuples[{5, 9}, #]) & /@ Range@ 5) (* _Giovanni Resta_, Mar 28 2017 *)
%o (Magma) [n: n in [1..100000] | Set(IntegerToSequence(n, 10)) subset {5, 9}]
%o (Python)
%o def a(n): return int(bin(n+1)[3:].replace('0', '5').replace('1', '9'))
%o print([a(n) for n in range(1, 45)]) # _Michael S. Branicky_, May 09 2021
%Y 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 nonn,base
%O 1,1
%A _Jaroslav Krizek_, Mar 28 2017
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