A044055 Numbers n such that string 1,0 occurs in the base 3 representation of n but not of n-1.

3, 9, 21, 27, 48, 57, 63, 75, 81, 129, 138, 144, 156, 165, 171, 183, 189, 210, 219, 225, 237, 243, 372, 381, 387, 399, 408, 414, 426, 432, 453, 462, 468, 480, 489, 495, 507, 513, 534, 543, 549, 561, 567, 615, 624, 630, 642, 651

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 3], {1, 0}]>0, 1, 0], {n, 700}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *)  (* Harvey P. Dale, Jul 15 2021 *)

Crossrefs

Sequence in context: A191177 A275450 A244972 * A029542 A014962 A014945

Adjacent sequences: A044052 A044053 A044054 * A044056 A044057 A044058

Keyword

nonn,base

Author

Clark Kimberling

Status

approved