A044062 Numbers k such that string 0,1 occurs in the base 4 representation of k but not of k-1.

17, 33, 49, 65, 68, 81, 97, 113, 129, 132, 145, 161, 177, 193, 196, 209, 225, 241, 257, 260, 272, 289, 305, 321, 324, 337, 353, 369, 385, 388, 401, 417, 433, 449, 452, 465, 481, 497, 513, 516, 528, 545, 561, 577, 580, 593, 609, 625, 641, 644, 657, 673, 689, 705, 708, 721

Offset

1,1

Links

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

Mathematica

A044062Q[k_] := StringContainsQ[IntegerString[k, 4], "01"] && StringFreeQ[IntegerString[k - 1, 4], "01"];
Select[Range[2000], A044062Q] (* Paolo Xausa, Sep 25 2025 *)

Crossrefs

Cf. A007090.

Sequence in context: A138393 A388066 A340000 * A044443 A158057 A249356

Adjacent sequences: A044059 A044060 A044061 * A044063 A044064 A044065

Keyword

nonn,base

Author

Clark Kimberling

Extensions

More terms from Paolo Xausa, Sep 25 2025

Status

approved