A044057 Numbers n such that string 1,2 occurs in the base 3 representation of n but not of n-1.

5, 14, 23, 32, 41, 59, 68, 77, 86, 95, 104, 113, 122, 167, 176, 185, 194, 203, 221, 230, 239, 248, 257, 266, 275, 284, 302, 311, 320, 329, 338, 347, 356, 365, 491, 500, 509, 518, 527, 545, 554, 563, 572, 581, 590, 599, 608, 653

Offset

1,1

Links

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

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 3], {1, 2}]>0, 1, 0], {n, 700}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jan 28 2020 *)

Crossrefs

Sequence in context: A043473 A017221 A052219 * A147825 A174263 A143057

Adjacent sequences: A044054 A044055 A044056 * A044058 A044059 A044060

Keyword

nonn,base

Author

Clark Kimberling

Status

approved