A044320 Numbers k such that the string 7,6 occurs in the base 9 representation of k but not of k-1.

69, 150, 231, 312, 393, 474, 555, 621, 636, 717, 798, 879, 960, 1041, 1122, 1203, 1284, 1350, 1365, 1446, 1527, 1608, 1689, 1770, 1851, 1932, 2013, 2079, 2094, 2175, 2256, 2337, 2418, 2499, 2580, 2661, 2742, 2808, 2823, 2904, 2985, 3066, 3147, 3228, 3309, 3390, 3471

Offset

1,1

Links

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

Mathematica

A044320Q[k_] := StringContainsQ[IntegerString[k, 9], "76"] && StringFreeQ[IntegerString[k - 1, 9], "76"];
Select[Range[5000], A044320Q] (* Paolo Xausa, Oct 07 2025 *)

Crossrefs

Cf. A007095.

Sequence in context: A044192 A044573 A063355 * A044701 A295926 A063322

Adjacent sequences: A044317 A044318 A044319 * A044321 A044322 A044323

Keyword

nonn,base

Author

Clark Kimberling

Extensions

More terms from Paolo Xausa, Oct 07 2025

Status

approved