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A044158 Numbers n such that string 2,6 occurs in the base 7 representation of n but not of n-1. 0
20, 69, 118, 140, 167, 216, 265, 314, 363, 412, 461, 483, 510, 559, 608, 657, 706, 755, 804, 826, 853, 902, 951, 980, 1049, 1098, 1147, 1169, 1196, 1245, 1294, 1343, 1392, 1441, 1490, 1512, 1539, 1588, 1637, 1686, 1735, 1784 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

MATHEMATICA

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 7], {2, 6}]>0, 1, 0], {n, 2000}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, May 31 2019 *)

CROSSREFS

Sequence in context: A303620 A221521 A145191 * A044539 A297597 A186735

Adjacent sequences:  A044155 A044156 A044157 * A044159 A044160 A044161

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified October 28 12:39 EDT 2020. Contains 338055 sequences. (Running on oeis4.)