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A044166 Numbers n such that string 4,0 occurs in the base 7 representation of n but not of n-1. 0
28, 77, 126, 175, 196, 224, 273, 322, 371, 420, 469, 518, 539, 567, 616, 665, 714, 763, 812, 861, 882, 910, 959, 1008, 1057, 1106, 1155, 1204, 1225, 1253, 1302, 1351, 1372, 1449, 1498, 1547, 1568, 1596, 1645, 1694, 1743, 1792 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

MATHEMATICA

Flatten[Position[Partition[Table[If[MemberQ[Partition[ IntegerDigits[ n, 7], 2, 1], {4, 0}], 1, 0], {n, 2000}], 2, 1], {0, 1}]]+1 (* Harvey P. Dale, Jan 20 2015 *)

CROSSREFS

Sequence in context: A277987 A116314 A341175 * A044547 A268733 A119178

Adjacent sequences:  A044163 A044164 A044165 * A044167 A044168 A044169

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified January 28 14:26 EST 2022. Contains 350656 sequences. (Running on oeis4.)