A032840 Numbers whose set of base-16 digits is {3,4}.

3, 4, 51, 52, 67, 68, 819, 820, 835, 836, 1075, 1076, 1091, 1092, 13107, 13108, 13123, 13124, 13363, 13364, 13379, 13380, 17203, 17204, 17219, 17220, 17459, 17460, 17475, 17476, 209715, 209716, 209731, 209732, 209971, 209972

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Index entries for 2-automatic sequences.

Mathematica

Flatten[Table[FromDigits[#, 16]&/@Tuples[{3, 4}, n], {n, 5}]] (* Vincenzo Librandi, May 31 2012 *)

Prog

(Magma) [n: n in [1..265000] | Set(IntegerToSequence(n, 16)) subset {3, 4}]; // Vincenzo Librandi, May 31 2012
(Python)
def a(n): return int(bin(n+1)[3:].replace('1', '4').replace('0', '3'), 16)
print([a(n) for n in range(1, 37)]) # Michael S. Branicky, Aug 22 2021

Crossrefs

Sequence in context: A056855 A208653 A080073 * A114694 A272337 A132678

Adjacent sequences: A032837 A032838 A032839 * A032841 A032842 A032843

Keyword

nonn,base,easy

Author

Clark Kimberling

Status

approved