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A044558 Numbers n such that string 5,4 occurs in the base 7 representation of n but not of n+1. 0
39, 88, 137, 186, 235, 279, 284, 333, 382, 431, 480, 529, 578, 622, 627, 676, 725, 774, 823, 872, 921, 965, 970, 1019, 1068, 1117, 1166, 1215, 1264, 1308, 1313, 1362, 1411, 1460, 1509, 1558, 1607, 1651, 1656, 1705, 1754, 1803 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..42.

MATHEMATICA

Transpose[SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 7], {5, 4}]>0, 1, 0], {n, 2000}], {1, 0}]][[1]] (* The program uses the SequencePosition and SequenceCount functions from Mathematica version 10 *) (* Harvey P. Dale, Jun 05 2016 *)

CROSSREFS

Sequence in context: A063335 A020264 A044177 * A242181 A020168 A063318

Adjacent sequences:  A044555 A044556 A044557 * A044559 A044560 A044561

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified December 5 08:36 EST 2021. Contains 349543 sequences. (Running on oeis4.)