A044083 Numbers k such that string 1,1 occurs in the base 5 representation of k but not of k-1.

6, 30, 56, 81, 106, 131, 150, 181, 206, 231, 256, 280, 306, 331, 356, 381, 405, 431, 456, 481, 506, 530, 556, 581, 606, 631, 655, 681, 706, 731, 750, 881, 905, 931, 956, 981, 1006, 1030, 1056, 1081, 1106, 1131, 1155, 1181, 1206, 1231, 1256, 1280, 1306, 1331, 1356, 1381, 1400

Offset

1,1

Links

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

Mathematica

A044083Q[k_] := StringContainsQ[IntegerString[k, 5], "11"] && StringFreeQ[IntegerString[k - 1, 5], "11"];
Select[Range[5000], A044083Q] (* Paolo Xausa, Sep 23 2025 *)

Crossrefs

Cf. A007091.

Sequence in context: A383636 A259752 A014203 * A381257 A377992 A239978

Adjacent sequences: A044080 A044081 A044082 * A044084 A044085 A044086

Keyword

nonn,base

Author

Clark Kimberling

Extensions

More terms from Paolo Xausa, Sep 23 2025

Status

approved