A044053 Numbers k such that string 0,1 occurs in the base 3 representation of k but not of k-1.

10, 19, 28, 30, 37, 46, 55, 57, 64, 73, 82, 84, 90, 100, 109, 111, 118, 127, 136, 138, 145, 154, 163, 165, 171, 181, 190, 192, 199, 208, 217, 219, 226, 235, 244, 246, 252, 262, 270, 298, 300, 307, 316, 325, 327, 333, 343, 352, 354, 361, 370, 379, 381, 388, 397, 406, 408

Offset

1,1

Links

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

Mathematica

A044053Q[k_] := StringContainsQ[IntegerString[k, 3], "01"] && StringFreeQ[IntegerString[k - 1, 3], "01"];
Select[Range[1000], A044053Q] (* Paolo Xausa, Sep 29 2025 *)

Crossrefs

Cf. A007089.

Sequence in context: A172055 A249648 A260263 * A044434 A098750 A089756

Adjacent sequences: A044050 A044051 A044052 * A044054 A044055 A044056

Keyword

nonn,base

Author

Clark Kimberling

Extensions

More terms from Paolo Xausa, Sep 29 2025

Status

approved