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A044261 Numbers n such that string 1,1 occurs in the base 9 representation of n but not of n-1. 0
10, 90, 172, 253, 334, 415, 496, 577, 658, 739, 810, 901, 982, 1063, 1144, 1225, 1306, 1387, 1468, 1548, 1630, 1711, 1792, 1873, 1954, 2035, 2116, 2197, 2277, 2359, 2440, 2521, 2602, 2683, 2764, 2845, 2926, 3006, 3088 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..39.

MATHEMATICA

Select[Range[3100], MemberQ[Partition[IntegerDigits[#, 9], 2, 1], {1, 1}] && !MemberQ[Partition[IntegerDigits[#-1, 9], 2, 1], {1, 1}]&] (* Harvey P. Dale, Mar 01 2012 *)

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 9], {1, 1}]>0, 1, 0], {n, 3100}], {0, 1}][[All, 2]] (* Harvey P. Dale, Aug 03 2021 *)

CROSSREFS

Sequence in context: A057081 A024132 A192898 * A065690 A202919 A202576

Adjacent sequences:  A044258 A044259 A044260 * A044262 A044263 A044264

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified September 26 03:46 EDT 2021. Contains 347664 sequences. (Running on oeis4.)