A044089 Numbers k such that string 2,2 occurs in the base 5 representation of k but not of k-1.

12, 37, 60, 87, 112, 137, 162, 185, 212, 237, 262, 287, 300, 337, 362, 387, 412, 435, 462, 487, 512, 537, 560, 587, 612, 637, 662, 685, 712, 737, 762, 787, 810, 837, 862, 887, 912, 925, 962, 987, 1012, 1037, 1060, 1087, 1112, 1137, 1162, 1185, 1212, 1237, 1262, 1287

Offset

1,1

Links

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

Mathematica

A044089Q[k_] := StringContainsQ[IntegerString[k, 5], "22"] && StringFreeQ[IntegerString[k - 1, 5], "22"];
Select[Range[5000], A044089Q] (* Paolo Xausa, Sep 23 2025 *)

Crossrefs

Cf. A007091.

Sequence in context: A045270 A012276 A045174 * A044470 A005892 A266398

Adjacent sequences: A044086 A044087 A044088 * A044090 A044091 A044092

Keyword

nonn,base

Author

Clark Kimberling

Extensions

More terms from Paolo Xausa, Sep 23 2025

Status

approved