A044068 Numbers n such that string 1,3 occurs in the base 4 representation of n but not of n-1.

7, 23, 28, 39, 55, 71, 87, 92, 103, 112, 135, 151, 156, 167, 183, 199, 215, 220, 231, 247, 263, 279, 284, 295, 311, 327, 343, 348, 359, 368, 391, 407, 412, 423, 439, 448, 519, 535, 540, 551, 567, 583, 599, 604, 615, 624, 647, 663

Offset

1,1

Links

Table of n, a(n) for n=1..48.

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 4], {1, 3}]>0, 1, 0], {n, 700}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Nov 05 2017 *)

Crossrefs

Sequence in context: A349230 A031450 A031116 * A109992 A070330 A095314

Adjacent sequences: A044065 A044066 A044067 * A044069 A044070 A044071

Keyword

nonn,base

Author

Clark Kimberling

Status

approved