A044203 Numbers k such that string 2,0 occurs in the base 8 representation of k but not of k-1.

16, 80, 128, 144, 208, 272, 336, 400, 464, 528, 592, 640, 656, 720, 784, 848, 912, 976, 1024, 1104, 1152, 1168, 1232, 1296, 1360, 1424, 1488, 1552, 1616, 1664, 1680, 1744, 1808, 1872, 1936, 2000, 2064, 2128, 2176, 2192, 2256, 2320, 2384, 2448, 2512, 2576, 2640, 2688, 2704

Offset

1,1

Links

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

Mathematica

A044203Q[k_] := StringContainsQ[IntegerString[k, 8], "20"] && StringFreeQ[IntegerString[k - 1, 8], "20"];
Select[Range[5000], A044203Q] (* Paolo Xausa, Sep 04 2025 *)

Crossrefs

Cf. A007094.

Sequence in context: A250279 A269584 A373927 * A044584 A111732 A271992

Adjacent sequences: A044200 A044201 A044202 * A044204 A044205 A044206

Keyword

nonn,base

Author

Clark Kimberling

Extensions

More terms from Paolo Xausa, Sep 04 2025

Status

approved