A044226 Numbers k such that string 4,7 occurs in the base 8 representation of k but not of k-1.

39, 103, 167, 231, 295, 312, 359, 423, 487, 551, 615, 679, 743, 807, 824, 871, 935, 999, 1063, 1127, 1191, 1255, 1319, 1336, 1383, 1447, 1511, 1575, 1639, 1703, 1767, 1831, 1848, 1895, 1959, 2023, 2087, 2151, 2215, 2279, 2343

Offset

1,1

Links

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

Mathematica

A044226Q[k_] := StringContainsQ[IntegerString[k, 8], "47"] && StringFreeQ[IntegerString[k - 1, 8], "47"];
Select[Range[5000], A044226Q] (* Paolo Xausa, Sep 03 2025 *)

Crossrefs

Cf. A007094.

Sequence in context: A211499 A126077 A276401 * A044607 A244694 A008878

Adjacent sequences: A044223 A044224 A044225 * A044227 A044228 A044229

Keyword

nonn,base

Author

Clark Kimberling

Status

approved