A043706 Numbers whose base-3 representation has an odd number of runs.

1, 2, 4, 8, 10, 11, 13, 15, 16, 19, 20, 21, 23, 26, 28, 29, 31, 35, 37, 38, 40, 42, 43, 45, 49, 51, 52, 55, 56, 58, 62, 63, 66, 68, 71, 73, 74, 75, 77, 80, 82, 83, 85, 89, 91, 92, 94, 96, 97, 100, 101, 102, 104, 107, 109, 110, 112, 116, 118

Offset: 1

Author

Clark Kimberling

Keywords

• nonn
• base

Programs

Mathematica

Select[Range[200],OddQ[Length[Split[IntegerDigits[#,3]]]]&] (* Harvey P. Dale, Mar 05 2020 *)