A044061 Numbers k such that string 0,0 occurs in the base 4 representation of k but not of k-1.

16, 32, 48, 64, 80, 96, 112, 128, 144, 160, 176, 192, 208, 224, 240, 256, 288, 304, 320, 336, 352, 368, 384, 400, 416, 432, 448, 464, 480, 496, 512, 544, 560, 576, 592, 608, 624, 640, 656, 672, 688, 704, 720, 736, 752, 768, 800, 816, 832, 848, 864, 880, 896, 912, 928, 944

Offset

1,1

Links

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

Mathematica

A044061Q[k_] := StringContainsQ[IntegerString[k, 4], "00"] && StringFreeQ[IntegerString[k - 1, 4], "00"];
Select[Range[2000], A044061Q] (* Paolo Xausa, Sep 25 2025 *)

Crossrefs

Cf. A007090.

Sequence in context: A217558 A044901 A008598 * A033028 A044841 A033013

Adjacent sequences: A044058 A044059 A044060 * A044062 A044063 A044064

Keyword

nonn,base

Author

Clark Kimberling

Extensions

More terms from Paolo Xausa, Sep 25 2025

Status

approved