A044078 Numbers k such that string 0,1 occurs in the base 5 representation of k but not of k-1.

26, 51, 76, 101, 126, 130, 151, 176, 201, 226, 251, 255, 276, 301, 326, 351, 376, 380, 401, 426, 451, 476, 501, 505, 526, 551, 576, 601, 626, 630, 650, 676, 701, 726, 751, 755, 776, 801, 826, 851, 876, 880, 901, 926, 951, 976, 1001, 1005, 1026, 1051, 1076, 1101, 1126

Offset

1,1

Links

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

Mathematica

A044078Q[k_] := StringContainsQ[IntegerString[k, 5], "01"] && StringFreeQ[IntegerString[k - 1, 5], "01"];
Select[Range[5000], A044078Q] (* Paolo Xausa, Sep 23 2025 *)

Crossrefs

Cf. A007091.

Sequence in context: A137263 A390600 A073249 * A044459 A158060 A169861

Adjacent sequences: A044075 A044076 A044077 * A044079 A044080 A044081

Keyword

nonn,base

Author

Clark Kimberling

Extensions

More terms from Paolo Xausa, Sep 23 2025

Status

approved