A043969 Numbers k such that 1 and 3 occur juxtaposed in the base-9 representation of k but not of k+1.

12, 28, 93, 116, 174, 190, 260, 271, 336, 352, 417, 433, 498, 514, 579, 595, 660, 676, 741, 757, 822, 845, 903, 919, 1052, 1065, 1081, 1146, 1162, 1227, 1243, 1308, 1324, 1389, 1405, 1470, 1486, 1551, 1574, 1632, 1648, 1718

Offset

1,1

Links

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

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 9], {1, 3}]>0 || SequenceCount[ IntegerDigits[n, 9], {3, 1}]>0, 1, 0], {n, 1800}], {1, 0}][[All, 1]] (* Harvey P. Dale, Feb 05 2023 *)

Crossrefs

Cf. A007095.

Sequence in context: A097427 A039366 A043189 * A204386 A078441 A351104

Adjacent sequences: A043966 A043967 A043968 * A043970 A043971 A043972

Keyword

nonn,base

Author

Clark Kimberling

Status

approved