A032931 Numbers whose set of base-11 digits is {1,2}.

1, 2, 12, 13, 23, 24, 133, 134, 144, 145, 254, 255, 265, 266, 1464, 1465, 1475, 1476, 1585, 1586, 1596, 1597, 2795, 2796, 2806, 2807, 2916, 2917, 2927, 2928, 16105, 16106, 16116, 16117, 16226, 16227, 16237, 16238, 17436, 17437

Offset

1,2

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000 (first 200 terms from Vincenzo Librandi)

Mathematica

fQ[n_]:=Union@Join[{1, 2}, IntegerDigits[n, 11]]=={1, 2}; Select[Range[0, 18000], fQ] (* Vincenzo Librandi, May 25 2012 *)
Table[FromDigits[#, 11]&/@Tuples[{1, 2}, n], {n, 5}]//Flatten (* Harvey P. Dale, Mar 01 2016 *)

Prog

(Magma) [n: n in [1..20000] | Set(IntegerToSequence(n, 11)) subset {1, 2}]; // Vincenzo Librandi, May 25 2012

Crossrefs

Sequence in context: A299961 A339139 A143795 * A072483 A081539 A141273

Adjacent sequences: A032928 A032929 A032930 * A032932 A032933 A032934

Keyword

nonn,base

Author

Clark Kimberling

Status

approved