A044292 Numbers k such that the string 4,5 occurs in the base 9 representation of k but not of k-1.

41, 122, 203, 284, 365, 369, 446, 527, 608, 689, 770, 851, 932, 1013, 1094, 1098, 1175, 1256, 1337, 1418, 1499, 1580, 1661, 1742, 1823, 1827, 1904, 1985, 2066, 2147, 2228, 2309, 2390, 2471, 2552, 2556, 2633, 2714, 2795, 2876, 2957, 3038, 3119, 3200, 3281, 3285, 3321

Offset

1,1

Links

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

Mathematica

A044292Q[k_] := StringContainsQ[IntegerString[k, 9], "45"] && StringFreeQ[IntegerString[k - 1, 9], "45"];
Select[Range[5000], A044292Q] (* Paolo Xausa, Oct 03 2025 *)

Crossrefs

Cf. A007095.

Sequence in context: A290589 A191867 A195317 * A044673 A135793 A135792

Adjacent sequences: A044289 A044290 A044291 * A044293 A044294 A044295

Keyword

nonn,base

Author

Clark Kimberling

Extensions

More terms from Paolo Xausa, Oct 03 2025

Status

approved