A043186 Numbers k such that 0 and 7 occur juxtaposed in the base-9 representation of k but not of k-1.

63, 88, 144, 169, 225, 250, 306, 331, 387, 412, 468, 493, 549, 567, 630, 655, 711, 736, 792, 817, 873, 898, 954, 979, 1035, 1060, 1116, 1141, 1197, 1222, 1278, 1296, 1359, 1384, 1440, 1465, 1521, 1546, 1602, 1627, 1683, 1708

Offset

1,1

Links

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

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 9], {0, 7}]>0 || SequenceCount[ IntegerDigits[n, 9], {7, 0}]>0, 1, 0], {n, 1800}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jul 27 2017 *)

Crossrefs

Cf. A007095.

Sequence in context: A240528 A320066 A125112 * A039363 A043966 A193417

Adjacent sequences: A043183 A043184 A043185 * A043187 A043188 A043189

Keyword

nonn,base

Author

Clark Kimberling

Status

approved