

A043880


Numbers n such that 0 and 1 occur juxtaposed in the base 4 representation of n but not of n+1.


0



4, 20, 33, 36, 49, 52, 84, 97, 100, 113, 116, 129, 135, 148, 161, 164, 177, 180, 193, 199, 212, 225, 228, 241, 244, 340, 353, 356, 369, 372, 385, 391, 404, 417, 420, 433, 436, 449, 455, 468, 481, 484, 497, 500, 513, 519, 543, 545
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OFFSET

1,1


LINKS

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


MATHEMATICA

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 4], {0, 1}]>0  SequenceCount[IntegerDigits[n, 4], {1, 0}]>0, 1, 0], {n, 600}], {1, 0}][[All, 1]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Sep 14 2016 *)


CROSSREFS

Sequence in context: A205670 A115428 A172624 * A030002 A238764 A085805
Adjacent sequences: A043877 A043878 A043879 * A043881 A043882 A043883


KEYWORD

nonn,base


AUTHOR

Clark Kimberling


STATUS

approved



