A044308 Numbers k such that the string 6,3 occurs in the base 9 representation of k but not of k-1.

57, 138, 219, 300, 381, 462, 513, 543, 624, 705, 786, 867, 948, 1029, 1110, 1191, 1242, 1272, 1353, 1434, 1515, 1596, 1677, 1758, 1839, 1920, 1971, 2001, 2082, 2163, 2244, 2325, 2406, 2487, 2568, 2649, 2700, 2730, 2811, 2892, 2973, 3054, 3135, 3216, 3297, 3378, 3429

Offset

1,1

Links

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

Mathematica

A044308Q[k_] := StringContainsQ[IntegerString[k, 9], "63"] && StringFreeQ[IntegerString[k - 1, 9], "63"];
Select[Range[5000], A044308Q] (* Paolo Xausa, Oct 06 2025 *)

Crossrefs

Cf. A007095.

Sequence in context: A063316 A020284 A140367 * A044689 A250606 A356423

Adjacent sequences: A044305 A044306 A044307 * A044309 A044310 A044311

Keyword

nonn,base

Author

Clark Kimberling

Extensions

More terms from Paolo Xausa, Oct 06 2025

Status

approved