A044220 Numbers k such that string 4,1 occurs in the base 8 representation of k but not of k-1.

33, 97, 161, 225, 264, 289, 353, 417, 481, 545, 609, 673, 737, 776, 801, 865, 929, 993, 1057, 1121, 1185, 1249, 1288, 1313, 1377, 1441, 1505, 1569, 1633, 1697, 1761, 1800, 1825, 1889, 1953, 2017, 2081, 2112, 2209, 2273, 2312

Offset

1,1

Links

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

Mathematica

A044220Q[k_] := StringContainsQ[IntegerString[k, 8], "41"] && StringFreeQ[IntegerString[k - 1, 8], "41"];
Select[Range[5000], A044220Q] (* Paolo Xausa, Sep 03 2025 *)

Crossrefs

Cf. A007094.

Sequence in context: A165378 A098938 A098923 * A044601 A195315 A098441

Adjacent sequences: A044217 A044218 A044219 * A044221 A044222 A044223

Keyword

nonn,base

Author

Clark Kimberling

Status

approved