A044649 - OEIS

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A044649

Numbers n such that string 1,8 occurs in the base 9 representation of n but not of n+1.

17, 98, 161, 179, 260, 341, 422, 503, 584, 665, 746, 827, 890, 908, 989, 1070, 1151, 1232, 1313, 1457, 1475, 1556, 1619, 1637, 1718, 1799, 1880, 1961, 2042, 2123, 2204, 2285, 2348, 2366, 2447, 2528, 2609, 2690, 2771, 2852

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

MATHEMATICA

Flatten[Position[Partition[Table[If[MemberQ[Partition[ IntegerDigits[ n, 9], 2, 1], {1, 8}], 1, 0], {n, 3000}], 2, 1], {1, 0}]] (* Harvey P. Dale, Mar 13 2015 *)

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 9], {1, 8}]>0, 1, 0], {n, 3000}], {1, 0}][[;; , 1]] (* Harvey P. Dale, Jan 30 2024 *)

CROSSREFS

Sequence in context: A282997 A231667 A044268 * A253707 A160827 A231671

Adjacent sequences: A044646 A044647 A044648 * A044650 A044651 A044652

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved