A044165 Numbers k such that string 3,6 occurs in the base 7 representation of k but not of k-1.

27, 76, 125, 174, 189, 223, 272, 321, 370, 419, 468, 517, 532, 566, 615, 664, 713, 762, 811, 860, 875, 909, 958, 1007, 1056, 1105, 1154, 1203, 1218, 1252, 1301, 1323, 1399, 1448, 1497, 1546, 1561, 1595, 1644, 1693, 1742, 1791, 1840, 1889, 1904, 1938, 1987, 2036, 2085

Offset

1,1

Links

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

Mathematica

A044165Q[k_] := StringContainsQ[IntegerString[k, 7], "36"] && StringFreeQ[IntegerString[k - 1, 7], "36"];
Select[Range[5000], A044165Q] (* Paolo Xausa, Sep 10 2025 *)

Crossrefs

Cf. A007093.

Sequence in context: A255109 A369063 A297326 * A044546 A217966 A255186

Adjacent sequences: A044162 A044163 A044164 * A044166 A044167 A044168

Keyword

nonn,base

Author

Clark Kimberling

Extensions

More terms from Paolo Xausa, Sep 10 2025

Status

approved