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%I #18 Sep 08 2022 08:44:51
%S 3,4,51,52,67,68,819,820,835,836,1075,1076,1091,1092,13107,13108,
%T 13123,13124,13363,13364,13379,13380,17203,17204,17219,17220,17459,
%U 17460,17475,17476,209715,209716,209731,209732,209971,209972
%N Numbers whose set of base-16 digits is {3,4}.
%H Vincenzo Librandi, <a href="/A032840/b032840.txt">Table of n, a(n) for n = 1..1000</a>
%H <a href="/index/Ar#2-automatic">Index entries for 2-automatic sequences</a>.
%t Flatten[Table[FromDigits[#,16]&/@Tuples[{3,4},n],{n,5}]] (* _Vincenzo Librandi_, May 31 2012 *)
%o (Magma) [n: n in [1..265000] | Set(IntegerToSequence(n, 16)) subset {3, 4}]; // _Vincenzo Librandi_, May 31 2012
%o (Python)
%o def a(n): return int(bin(n+1)[3:].replace('1', '4').replace('0', '3'), 16)
%o print([a(n) for n in range(1, 37)]) # _Michael S. Branicky_, Aug 22 2021
%K nonn,base,easy
%O 1,1
%A _Clark Kimberling_
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