A044302 Numbers k such that the string 5,6 occurs in the base 9 representation of k but not of k-1.

51, 132, 213, 294, 375, 456, 459, 537, 618, 699, 780, 861, 942, 1023, 1104, 1185, 1188, 1266, 1347, 1428, 1509, 1590, 1671, 1752, 1833, 1914, 1917, 1995, 2076, 2157, 2238, 2319, 2400, 2481, 2562, 2643, 2646, 2724, 2805, 2886, 2967, 3048, 3129, 3210, 3291, 3372, 3375

Offset

1,1

Links

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

Mathematica

A044302Q[k_] := StringContainsQ[IntegerString[k, 9], "56"] && StringFreeQ[IntegerString[k - 1, 9], "56"];
Select[Range[5000], A044302Q] (* Paolo Xausa, Oct 06 2025 *)

Crossrefs

Cf. A007095.

Sequence in context: A365834 A097644 A353987 * A044683 A348000 A044383

Adjacent sequences: A044299 A044300 A044301 * A044303 A044304 A044305

Keyword

nonn,base

Author

Clark Kimberling

Extensions

More terms from Paolo Xausa, Oct 06 2025

Status

approved