A044119 Numbers k such that string 2,5 occurs in the base 6 representation of k but not of k-1.

17, 53, 89, 102, 125, 161, 197, 233, 269, 305, 318, 341, 377, 413, 449, 485, 521, 534, 557, 593, 612, 665, 701, 737, 750, 773, 809, 845, 881, 917, 953, 966, 989, 1025, 1061, 1097, 1133, 1169, 1182, 1205, 1241, 1277, 1313, 1349, 1385, 1398, 1421, 1457, 1493, 1529, 1565

Offset

1,1

Links

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

Mathematica

A044119Q[k_] := StringContainsQ[IntegerString[k, 6], "25"] && StringFreeQ[IntegerString[k - 1, 6], "25"];
Select[Range[5000], A044119Q] (* Paolo Xausa, Sep 11 2025 *)

Crossrefs

Cf. A007092.

Sequence in context: A395099 A287311 A285225 * A044500 A142105 A031383

Adjacent sequences: A044116 A044117 A044118 * A044120 A044121 A044122

Keyword

nonn,base

Author

Clark Kimberling

Extensions

More terms from Paolo Xausa, Sep 11 2025

Status

approved