A043728 Numbers whose number of runs in their base-2 representation is congruent to 0 mod 5.

21, 37, 41, 43, 45, 53, 69, 73, 75, 77, 81, 83, 87, 89, 91, 93, 101, 105, 107, 109, 117, 133, 137, 139, 141, 145, 147, 151, 153, 155, 157, 161, 163, 167, 175, 177, 179, 183, 185, 187, 189, 197, 201, 203, 205, 209, 211, 215, 217, 219, 221, 229, 233, 235, 237, 245, 261, 265

Offset

1,1

Links

Paolo Xausa, Table of n, a(n) for n = 1..10000

Mathematica

A043728Q[k_] := Divisible[Length[Split[IntegerDigits[k, 2]]], 5];
Select[Range[300], A043728Q] (* Paolo Xausa, Oct 28 2025 *)

Crossrefs

Supersequence of A043572.

Cf. A007088.

Sequence in context: A043751 A043759 A043768 * A083567 A109211 A224701

Adjacent sequences: A043725 A043726 A043727 * A043729 A043730 A043731

Keyword

nonn,base

Author

Clark Kimberling

Extensions

More terms from Paolo Xausa, Oct 28 2025

Status

approved