A044341 Numbers k such that the string 0,9 occurs in the base 10 representation of k but not of k-1.

109, 209, 309, 409, 509, 609, 709, 809, 909, 1009, 1090, 1109, 1209, 1309, 1409, 1509, 1609, 1709, 1809, 1909, 2009, 2090, 2109, 2209, 2309, 2409, 2509, 2609, 2709, 2809, 2909, 3009, 3090, 3109, 3209, 3309, 3409, 3509, 3609, 3709, 3809, 3909, 4009, 4090, 4109, 4209, 4309

Offset

1,1

Links

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

Mathematica

A044341Q[k_] := StringContainsQ[IntegerString[k], "09"] && StringFreeQ[IntegerString[k - 1], "09"];
Select[Range[5000], A044341Q] (* Paolo Xausa, Nov 03 2025 *)

Crossrefs

Sequence in context: A060978 A061879 A171121 * A044722 A142697 A142777

Adjacent sequences: A044338 A044339 A044340 * A044342 A044343 A044344

Keyword

nonn,base

Author

Clark Kimberling

Extensions

More terms from Paolo Xausa, Nov 03 2025

Status

approved