A043098 Numbers k such that 0 and 2 occur juxtaposed in the base-3 representation of k but not of k-1.

6, 11, 15, 18, 24, 29, 33, 38, 42, 45, 51, 54, 65, 69, 72, 78, 83, 87, 92, 96, 99, 110, 114, 119, 123, 126, 132, 135, 146, 150, 153, 159, 162, 191, 195, 200, 204, 207, 213, 216, 227, 231, 234, 240, 245, 249, 254, 258, 261, 272, 276

Offset

1,1

Links

Table of n, a(n) for n=1..51.

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 3], {0, 2}]>0 || SequenceCount[ IntegerDigits[n, 3], {2, 0}]>0, 1, 0], {n, 300}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Sep 10 2019 *)

Crossrefs

Cf. A007089.

Sequence in context: A315392 A315393 A315394 * A039276 A044995 A135708

Adjacent sequences: A043095 A043096 A043097 * A043099 A043100 A043101

Keyword

nonn,base

Author

Clark Kimberling

Status

approved