A044218 Numbers k such that string 3,7 occurs in the base 8 representation of k but not of k-1.

31, 95, 159, 223, 248, 287, 351, 415, 479, 543, 607, 671, 735, 760, 799, 863, 927, 991, 1055, 1119, 1183, 1247, 1272, 1311, 1375, 1439, 1503, 1567, 1631, 1695, 1759, 1784, 1823, 1887, 1951, 1984, 2079, 2143, 2207, 2271, 2296

Offset

1,1

Links

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

Mathematica

A044218Q[k_] := StringContainsQ[IntegerString[k, 8], "37"] && StringFreeQ[IntegerString[k - 1, 8], "37"];
Select[Range[5000], A044218Q] (* Paolo Xausa, Sep 03 2025 *)

Crossrefs

Cf. A007094.

Sequence in context: A042894 A042896 A042898 * A044599 A143032 A159014

Adjacent sequences: A044215 A044216 A044217 * A044219 A044220 A044221

Keyword

nonn,base

Author

Clark Kimberling

Status

approved