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A044012 Numbers n such that 1 and 9 occur juxtaposed in the base 10 representation of n but not of n+1. 0
19, 91, 119, 199, 219, 291, 319, 391, 419, 491, 519, 591, 619, 691, 719, 791, 819, 891, 919, 991, 1019, 1091, 1119, 1199, 1219, 1291, 1319, 1391, 1419, 1491, 1519, 1591, 1619, 1691, 1719, 1791, 1819, 1891, 1999, 2019, 2091 (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], {1, 9}]>0 || SequenceCount[ IntegerDigits[n], {9, 1}]>0, 1, 0], {n, 2100}], {1, 0}][[All, 1]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Apr 12 2019 *)

CROSSREFS

Sequence in context: A039409 A038653 A043232 * A288485 A214532 A118294

Adjacent sequences:  A044009 A044010 A044011 * A044013 A044014 A044015

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified October 18 05:07 EDT 2019. Contains 328145 sequences. (Running on oeis4.)