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A043987 Numbers n such that 4 and 6 occur juxtaposed in the base 9 representation of n but not of n+1. 0
42, 58, 123, 139, 204, 220, 285, 301, 366, 386, 447, 463, 530, 544, 609, 625, 690, 706, 771, 787, 852, 868, 933, 949, 1014, 1030, 1095, 1115, 1176, 1192, 1259, 1273, 1338, 1354, 1419, 1435, 1500, 1516, 1581, 1597, 1662, 1678 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

MATHEMATICA

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 9], {4, 6}]>0 || SequenceCount[IntegerDigits[n, 9], {6, 4}]>0, 1, 0], {n, 1700}], {1, 0}] [[All, 1]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jan 25 2017 *)

CROSSREFS

Sequence in context: A080971 A039384 A043207 * A300378 A300680 A053323

Adjacent sequences:  A043984 A043985 A043986 * A043988 A043989 A043990

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified August 26 05:23 EDT 2019. Contains 326328 sequences. (Running on oeis4.)