A043571 Numbers whose base-2 representation has exactly 4 runs.

10, 18, 20, 22, 26, 34, 36, 38, 40, 44, 46, 50, 52, 54, 58, 66, 68, 70, 72, 76, 78, 80, 88, 92, 94, 98, 100, 102, 104, 108, 110, 114, 116, 118, 122, 130, 132, 134, 136, 140, 142, 144, 152, 156, 158, 160, 176, 184, 188, 190, 194, 196

Offset: 1

Author

Clark Kimberling

Keywords

• nonn
• base

Comments

There are no odd terms. - Harvey P. Dale, Mar 09 2025

Links

• Harvey P. Dale, Table of n, a(n) for n = 1..1000

Programs

Mathematica

Select[Range[2,200,2],Length[Split[IntegerDigits[#,2]]]==4&] (* Harvey P. Dale, Mar 09 2025 *)