A043121 Numbers k such that 1 and 2 occur juxtaposed in the base-6 representation of k but not of k-1.

8, 13, 44, 48, 78, 85, 116, 121, 152, 157, 188, 193, 224, 229, 260, 264, 288, 332, 337, 368, 373, 404, 409, 440, 445, 468, 510, 517, 548, 553, 584, 589, 620, 625, 656, 661, 692, 696, 726, 733, 764, 769, 800, 805, 836, 841, 872

Offset

1,1

Links

Table of n, a(n) for n=1..47.

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 6], {1, 2}]>0 || SequenceCount[IntegerDigits[n, 6], {2, 1}]>0, 1, 0], {n, 1000}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Nov 27 2016 *)

Crossrefs

Cf. A007092.

Sequence in context: A360790 A218627 A279711 * A043901 A359553 A081966

Adjacent sequences: A043118 A043119 A043120 * A043122 A043123 A043124

Keyword

nonn,base

Author

Clark Kimberling

Status

approved