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A044004 Numbers k such that 0 and 9 occur juxtaposed in the base-10 representation of k but not of k+1. 0
90, 109, 190, 209, 290, 309, 390, 409, 490, 509, 590, 609, 690, 709, 790, 809, 890, 909, 990, 1009, 1099, 1109, 1190, 1209, 1290, 1309, 1390, 1409, 1490, 1509, 1590, 1609, 1690, 1709, 1790, 1809, 1890, 1909, 1990, 2009, 2099 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..41.

MATHEMATICA

SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {0, 9}]>0 || SequenceCount[ IntegerDigits[n], {9, 0}]>0, 1, 0], {n, 2200}], {1, 0}][[All, 1]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jun 28 2021 *)

CROSSREFS

Sequence in context: A333745 A043224 A039401 * A078493 A176683 A135197

Adjacent sequences:  A044001 A044002 A044003 * A044005 A044006 A044007

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified September 21 01:46 EDT 2021. Contains 347596 sequences. (Running on oeis4.)