A043194 Numbers k such that 1 and 8 occur juxtaposed in the base-9 representation of k but not of k-1.

17, 73, 98, 153, 179, 235, 260, 316, 341, 397, 422, 478, 503, 559, 584, 640, 657, 721, 746, 802, 827, 882, 908, 964, 989, 1045, 1070, 1126, 1151, 1207, 1232, 1288, 1313, 1369, 1377, 1475, 1531, 1556, 1611, 1637, 1693, 1718

Offset

1,1

Links

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

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 9], {1, 8}]> 0 || SequenceCount[IntegerDigits[n, 9], {8, 1}]>0, 1, 0], {n, 2000}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Nov 23 2019 *)

Crossrefs

Cf. A007095.

Sequence in context: A144245 A307718 A139919 * A043974 A141972 A161735

Adjacent sequences: A043191 A043192 A043193 * A043195 A043196 A043197

Keyword

nonn,base

Author

Clark Kimberling

Status

approved