A044161 Numbers k such that string 3,2 occurs in the base 7 representation of k but not of k-1.

23, 72, 121, 161, 170, 219, 268, 317, 366, 415, 464, 504, 513, 562, 611, 660, 709, 758, 807, 847, 856, 905, 954, 1003, 1052, 1101, 1127, 1190, 1199, 1248, 1297, 1346, 1395, 1444, 1493, 1533, 1542, 1591, 1640, 1689, 1738, 1787, 1836, 1876, 1885, 1934, 1983, 2032, 2081

Offset

1,1

Links

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

Mathematica

A044161Q[k_] := StringContainsQ[IntegerString[k, 7], "32"] && StringFreeQ[IntegerString[k - 1, 7], "32"];
Select[Range[5000], A044161Q] (* Paolo Xausa, Sep 10 2025 *)

Crossrefs

Cf. A007093.

Sequence in context: A035072 A201716 A269521 * A044542 A141945 A267821

Adjacent sequences: A044158 A044159 A044160 * A044162 A044163 A044164

Keyword

nonn,base

Author

Clark Kimberling

Extensions

More terms from Paolo Xausa, Sep 10 2025

Status

approved