A044290 Numbers k such that the string 4,3 occurs in the base 9 representation of k but not of k-1.

39, 120, 201, 282, 351, 363, 444, 525, 606, 687, 768, 849, 930, 1011, 1080, 1092, 1173, 1254, 1335, 1416, 1497, 1578, 1659, 1740, 1809, 1821, 1902, 1983, 2064, 2145, 2226, 2307, 2388, 2469, 2538, 2550, 2631, 2712, 2793, 2874, 2955, 3036, 3117, 3159, 3267, 3279, 3360

Offset

1,1

Links

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

Mathematica

A044290Q[k_] := StringContainsQ[IntegerString[k, 9], "43"] && StringFreeQ[IntegerString[k - 1, 9], "43"];
Select[Range[5000], A044290Q] (* Paolo Xausa, Oct 02 2025 *)

Crossrefs

Cf. A007095.

Sequence in context: A008878 A249301 A239562 * A044671 A020266 A033576

Adjacent sequences: A044287 A044288 A044289 * A044291 A044292 A044293

Keyword

nonn,base

Author

Clark Kimberling

Extensions

More terms from Paolo Xausa, Oct 02 2025

Status

approved