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A044449 Numbers n such that string 1,3 occurs in the base 4 representation of n but not of n+1. 2
7, 23, 31, 39, 55, 71, 87, 95, 103, 127, 135, 151, 159, 167, 183, 199, 215, 223, 231, 247, 263, 279, 287, 295, 311, 327, 343, 351, 359, 383, 391, 407, 415, 423, 439, 511, 519, 535, 543, 551, 567, 583, 599, 607, 615, 639, 647, 663 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

MATHEMATICA

Transpose[SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 4], {1, 3}]>0, 1, 0], {n, 700}], {1, 0}]][[1]] (* The program uses the SequencePosition and SequenceCount functions from Mathematica version 10 *) (* Harvey P. Dale, Apr 19 2015 *)

CROSSREFS

Sequence in context: A080802 A078515 A225822 * A095087 A144517 A225185

Adjacent sequences:  A044446 A044447 A044448 * A044450 A044451 A044452

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified July 31 17:39 EDT 2021. Contains 346376 sequences. (Running on oeis4.)