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 A032920 Numbers whose set of base-13 digits is {1,3}. 1
 1, 3, 14, 16, 40, 42, 183, 185, 209, 211, 521, 523, 547, 549, 2380, 2382, 2406, 2408, 2718, 2720, 2744, 2746, 6774, 6776, 6800, 6802, 7112, 7114, 7138, 7140, 30941, 30943, 30967, 30969, 31279, 31281, 31305, 31307, 35335, 35337 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 MATHEMATICA Flatten[Table[FromDigits[#, 13]&/@Tuples[{1, 3}, n], {n, 5}]] (* Vincenzo Librandi, Jun 03 2012 *) PROG (Magma) [n: n in [1..36000] | Set(IntegerToSequence(n, 13)) subset {1, 3}]; // Vincenzo Librandi, Jun 03 2012 (Python) def A032920(n): return (int(bin(m:=n+1)[3:], 13)<<1) + (13**(m.bit_length()-1)-1)//12 # Chai Wah Wu, Oct 13 2023 CROSSREFS Sequence in context: A195864 A349767 A022890 * A134767 A022125 A121459 Adjacent sequences: A032917 A032918 A032919 * A032921 A032922 A032923 KEYWORD nonn,base AUTHOR Clark Kimberling STATUS approved

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Last modified September 15 15:59 EDT 2024. Contains 375938 sequences. (Running on oeis4.)